Kurniawan's AjAx .NET

There was an error processing the request

2010-08-19T00:27:00.000-07:00

If you get that above error.. and you have no idea what's wrong with it just put change "CustomError='Off'"

WebForm_... is not Defined error

2010-08-16T19:51:00.000-07:00

If you get this error "WebForm_ is not defined error..."
and previously you never get this problem...

---
you may install a plugin which compress the .axd file...

---

solution:
you need to exclude them on the compression module...
please check your .axd name.. and exclude them on your HTTP compression module

it needs this 2 file not to be compressed
System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions

and

System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions

Protect yourself from XSS attack with new ASP 4.0 nuggets

2010-08-01T05:13:00.000-07:00

In ASP.NET 4.0, you can replace your usually habit to use <%=%> with this new nuggets <%: %>
This will automatically protect your applications against cross-site script injection (XSS) and HTML injection attacks and avoid duplicate encoding.

So you don't need to worry if you forget to encode your string in the aspx files. or protect it using AntiXSS.

It's very usefull in combination of MVC framework 2.0

IsCallBack VS IsPostback

2010-07-22T19:16:00.000-07:00

I just looking in couple framework. and just curious what they use to bind the UI is using
! IsCallback instead of ! IsPostback

Why ?

Just making summary out of this
http://msdn.microsoft.com/en-us/library/ms178141.aspx

IsCallBack will be set to true if you doing a partial postback.

if you checking using IsCallBack and there is no ajax call , it will not affect anything. Just similar like you don't use the checking which is doesn't improve your performance.

But there should be a reason behind it, or probably they have a mistype because of Autocomplete provided by VS =p

Protect your apps from ClickJacking

2010-07-14T23:31:00.000-07:00

Here an interesting video which I recently lookat.

http://www.youtube.com/watch?v=gxyLbpldmuU

To protect your apps

put this code

if (top != self)
{
self.location.href = "http://yoursite.com";
}

CSRF Attack Prevention on .NET

2010-07-12T17:24:00.000-07:00

In Addition to Rob's AntiXSS, we also need to secure CSRF Attack in Defence Jobs.

Here is what I found :

* Check this video to understand how the CSRF works & How you check your site if it is secure.

http://www.securitytube.net/Discovering-CSRF-with-OWASP%27s-CSRFTester-Tool-video.aspx

* Prevention

- ViewStateUserKey in (ASP.NET)

If you use viewstate in ASP.NET. it is recommended that you include ViewStateUserKey and Encript them

*(Include this on your base page)

protected override OnInit(EventArgs e)

{
base.OnInit(e);
if (User.Identity.IsAuthenticated)
ViewStateUserKey = Session.SessionID;

}

* Encript your viewstate in web.config (ViewStateEncriptionMode="Always")
http://msdn.microsoft.com/en-us/library/aa479501.aspx

Note:
However ViewStateUserKey this is not fully protect you from CSRF. This just to add an addition security layer to your application.
http://keepitlocked.net/archive/2008/05/29/viewstateuserkey-doesn-t-prevent-cross-site-request-forgery.aspx

* Recommended Prevention

Because ViewStateUserKey is not completely protect you from the CSRF Attack, You need to protect your application using per-request nonce to hidden form / URL

There are framework which can automatically done this.

* .NET CSRF GUARD http://www.owasp.org/index.php/.Net_CSRF_Guard

- This .NET version unfortunately only supply protection using URL method. (Nonce token is added on URL). This version doesn't support the hidden field method.

* ANTICSRF for ASP.NET (RECOMMENDED) http://idunno.org/archive/2008/12/14/announcing-anticsrf-for-asp.net.aspx

This framework (.NET HTTPModule) will added the per-request nonce to hidden field & cookies and validate it when post method or postback triggered.

========================================================

Installation of ANTICSRF http://anticsrf.codeplex.com/

- Add AntiCSRF.dll to Bin Folder

- Register AntiCSRF HttpModule on web config


 ....
 
   
  
 ....

- Configure Settings


   ....
   
       ....
         
       ....

    - If you don't want to proptect your page,
        you can add class attribute [Idunno.AntiCsrf.SuppressCsrfCheck]
        or page interface <%@ Implements Interface="Idunno.AntiCsrf.ISuppressCsrfCheck" %>


==================================================================

 How it works (ANTICSRF)
 
    * HTTP MODULE on PreSendRequestHeaders and PreRequestHandlerExecute
               context.PreSendRequestHeaders += PreSendRequestHeaders;
        context.PreRequestHandlerExecute += PreRequestHandlerExecute;

   * Adding pre-request nonce token
        - Add nonce on hidden field __CSRFTOKEN and cokkie __CSRFCOOKIE (configurable on settings)
    
     * Validate nonce token on hidden field with cokkie
 
        - It will validate the token when (POST Request or Postback)

 
        - Get Request will NOT be validated unless it is Postback
 
        - It will NOT validate any SuppressCsrfCheck class attribute or any class which inherits Idunno.AntiCsrf.ISuppressCsrfCheck
 
     * If Attack detected
        -When
            - hidden field or cookkie token are null/empty
        - hidden field and cookkie token is not match
     -ACTION (based on configuration setting detectionResult)
      - Throw an exception
        - Or redirect to other page based on configuration setting (errorPage)

==================================================================

Limitations of ANTICSRF

Non-ASP.NET forms are not protected with this module.

You, the developer, must ensure your GET requests are idempotent (i.e. the side-effects of multiple identical requests are the same as for a single request). GET requests are not protected with this module. See http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.1.2.

---------------------

* This Framework will not protect the GET Request (Except if it is postback).

For example
- when you use AJAX call using GET Request, It will not validate the token.

- But if you want to use AJAX call using the POST Request,
You must Suppress the AntiCSRF validation by what I mention above on the Intallation. by adding the attribute or page attribute.

Because If you don't suppress the AntiCSRF validation, it will detect as AntiCSRF Attack, because they can't find the token located on your hidden field.

Please have a read on How It Works explanation above.

---------------------

XSS Prevention attack

2010-07-12T16:31:00.000-07:00

Most web developer must know about RequestValidation configuration in .NET
which we can disable the XSS attack.

But If we want to disable 'RequestValidation' it so we can have flexibility to handle it, We can use Server.HtmlEncode(). to display it.

However this still not enough. This will expose to XSS attack.
My college (Rob) find a utility which nice to replace Server.HTMLEncode().

Download AntiXSSLibrary.dll
and replace Server.HTMLEncode() with AntiXss.UrlEncode();

http://msdn.microsoft.com/en-us/library/aa973813.aspx
http://blogs.msdn.com/b/cisg/archive/2008/08/26/what-is-microsoft-antixss.aspx

Remember clientaccesspolicy

2010-06-22T18:03:00.000-07:00

Remember to have clientaccesspolicy.xml

to enable your WCF to be consumed by silverlight

http://videos.visitmix.com/MIX09/T42F
http://community.dynamics.com/blogs/cesardalatorre/comments/9579.aspx

Calling SP using NHibernate with IDBCommand

2010-06-09T22:03:00.000-07:00

If there is transaction open.
you need to supply the transaction by enlist it in NHibernate

iSession.Transaction.Enlist(sqlComm);

inject javascript in bookmark

2010-06-09T17:31:00.000-07:00

Get stuff from GBone..

it's pretty amazing that we can inject javascript to debug on browser

put this bookmark..
javascript:
var b=document.body;
if(b)
{
void(z=document.createElement('script'));
void(z.src='http://www.company.com/somescript.js');
void(b.appendChild(z));
}

this will run that script on your browser

Jquery.Data

2010-06-09T16:57:00.000-07:00

Learning new stuff today..from Rob...

It's better to use Jquery.Data instead of custom attribute in element.
because it will break some browser for custom attribute which not standard.

Thanks Rob..

Here is the example

jQuery.data(div, "test", { first: 16, last: "pizza!" });
$("span:first").text(jQuery.data(div, "test").first);
$("span:last").text(jQuery.data(div, "test").last);

System.Web.Extension conflicting with the GAC

2010-06-03T23:26:00.000-07:00

Be careful when you upgrade the site into 3.5
if you get this error about ambigous with GAC version.
then you need to take this out from your bin folder.

because It may be your version in bin folder is different. 1.1
but in GAC version is 3.5.

Without Postback with disable your browser Javascript

2010-06-02T19:17:00.001-07:00

Postback is very heavy code to load (viewstate,etc).
such as you want to get rid of this from your form .

So the solution is you can use AJAX.. to handle all this postback to make your page still dynamic or more responsive that before.

But how about if the client browser disable their javascript..
Your page will be static.

so you need to consider this as well.

So the big picture of this solution is to put ajax as common.
but on the event onclick or href.. you can't just call that function to call an ajax.

for example
href="javascript:CallPostbackFunction();"

you need to change this to
href="/page/ajax/somePage.aspx" class="AjaxCall"

then.. in you can check .. if the browser is enabled the javascript..
then you can call your ajax function.

If the javascript is disabled from your browser then you still can load to the proper page. instead of just do nothing.

//check if browser enabled their javascript
jQuery(document).ready(function() {
//perform init and replace to an proper javascript
var ajaxCalls = $('#ajaxCall');
ajaxCalls.unbind('click', this.addClick);
ajaxCalls.bind('click', this.addClick);
});

Here a good reference for Object Oriented Programming in Javascript
http://devedge-temp.mozilla.org/viewsource/2001/oop-javascript/

response.d in .net 3.5 JSON

2010-03-28T22:00:00.000-07:00

Migrate Json .Net 2.0 to .Net 3.5

Here need to be note...
================
response.d

While I wish this unexpected change had been more clearly announced, it’s a good one. Here’s how Dave Reed explained it to me:

{"d": 1 }

Is not a valid JavaScript statement, where as this:

[1]

Is.

So the wrapping of the "d" parameter prevents direct execution of the string as script. No Object or Array constructor worries.

[] is JavaScript’s array literal notation, allowing you to instantiate an array without explicitly calling a constructor. To expand on Dave’s explanation, simply consider this code:

=====================
make sure you change web.config to use ScriptService of v 3.5 in HttpHandlers

add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"

Jquery AJAX impacted on document.write

2009-08-03T20:39:00.000-07:00

just find a solution, when you use jquery ajax, and there is document.write after that, it will clear all your content..

all u need to do is create a span, where you want to write that content. then.. overwrite document.write function to write into that span instead doing document.write..

here is the sample

span id="test" /span
script document.write = function(text){ jQuery('#test').append(text) }
/script

=D
Here is the reference
http://javascript.about.com/library/blwrite.htm

--------
Huh.. but this still have a problem.. in IE.. if you overwrite into different holder.

so the best solution at this moment is using iframe...

Change culture without changing deployment Server

2009-05-10T22:33:00.001-07:00

Add globalization tag inside System.web tag in Web.Config

globalization requestEncoding="utf-8" responseEncoding="utf-8" culture="en-AU"

1st NHibernate.LINQ Limitation

2009-04-01T20:34:00.000-07:00

Just found Nhibernate Linq limitation.

It can't translate toLower() on string but luckily, it has compare in case sensitive.

it throws weird error if you use this.
q = q.Where(c => c.firstName.Contains(flter) || c.lastName.Contains(flter) || c.email.Contains(flter));

says
----
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
----

Restricting Text box (Multiline) using Javascript

2009-03-02T23:04:00.000-08:00

//Restrict Length
function restrictLength(e,ctl,maxLength)
{
var evt = e ? e : window.event;

//check the length for copy paste
if (ctl.value.length >= maxLength)
{
//only character
if (e.keyCode == 0)
{
return false;
}
}
return true;
}
-- don't for get to called using (RETURN)
javascript:return restrictLength(event,this,10);

Sending Email from HTML

2009-03-02T23:02:00.000-08:00

I decide to use File rather then web request coz some server are restricted to loopback.

///

/// Get Email Body from file
///

///
public static string GetEmailBodyFromFile(string filePath)
{
string emailMasterBody = "";

Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
using (System.IO.StreamReader objReader = new StreamReader(filePath, encode))
{
emailMasterBody = objReader.ReadToEnd();
}

return emailMasterBody;
}

PL-SQL Looping

2008-12-02T21:53:00.000-08:00

DECLARE CursorTemplate CURSOR
FAST_FORWARD FOR
SELECT Val1, Val2, Val3 FROM Table1

OPEN CursorTemplate

FETCH NEXT FROM CursorTemplate
INTO @Var1, @Var2, @Var3

WHILE (@@FETCH_STATUS = 0)
BEGIN
--do something here w/ your data

FETCH NEXT FROM CursorTemplate
INTO @Var1, @Var2, @Var3

END

CLOSE CursorTemplate
DEALLOCATE CursorTemplate

Fix Calendar Extender on IE 6

2008-11-26T21:20:00.000-08:00

add this style
.ajax__calendar_container { z-index : 1004 ; }

add this javascript
function dateEditor_OnShown(dateControl, emptyEventArgs)
{
var shimWidth = dateControl._width;
var shimHeight = dateControl._height;

// Open current popup
// Create the popup element
var dateEditorShim;
dateEditorShim = document.getElementById("dateEditorShim");
dateEditorShim.style.width = dateControl._popupDiv.offsetWidth;
dateEditorShim.style.height = dateControl._popupDiv.offsetHeight;
dateEditorShim.style.top = dateControl._popupDiv.style.top;
dateEditorShim.style.left = dateControl._popupDiv.style.left;
dateControl._popupDiv.style.zIndex = 999;
dateEditorShim.style.zIndex = 998;
dateEditorShim.style.display = "block";

}

// Function: dateEditor_OnShown
// Summary: Handles the OnShown event of the dateEditor control.
// Inputs: dateControl -> The date control object
// emptyEventArgs -> Empty event arguments raised by the date control
// Remarks: Make sure to insert a shim of an empty iframe underneath the calendar popup container
function dateEditor_OnHiding(dateControl, emptyEventArgs)
{
var shimWidth = 0;
var shimHeight = 0;

// Open current popup
// Create the popup element
var dateEditorShim;
dateEditorShim = document.getElementById("dateEditorShim");
dateEditorShim.style.width = 0;
dateEditorShim.style.height = 0;
dateEditorShim.style.top = 0;
dateEditorShim.style.left = 0;
dateEditorShim.style.display = "none";
}

//add this in code
calDOB.OnClientShown = "dateEditor_OnShown";
calDOB.OnClientHiding = "dateEditor_OnHiding";

Error in Calendar Extender because the master page has asp tag <%%>

2008-11-25T18:48:00.000-08:00

Today, I just annoyed with this error.
Every form which using Calendar extension works fine before.
and somehow after I change the master page, it start to show an error said :

=================
System.Web.HttpException: The Controls collection cannot be modified because the control contains code blocks (i.e. ).
=================

Luckily, with Tom's Help, I found the problem.
It was on the master page on the header java script which use <%= ... %> to get the content from server....

Pomegranate Phone

2008-11-20T19:39:00.001-08:00

http://www.pomegranatephone.com/default.html

Url Rewriting VS Postback

2008-11-19T19:58:00.000-08:00

To Resolve a problem in postback for url rewriting,
you can use control adaptor and rewrite the form.

public class FormRewriter : System.Web.UI.Adapters.ControlAdapter

more information : visit : http://weblogs.asp.net/scottgu/archive/2007/02/26/tip-trick-url-rewriting-with-asp-net.aspx

EnableSortingAndPagingCallback Issue With LinqDataSource

2008-10-23T16:22:00.000-07:00

Today, I found an issue with EnableSortingAndPagingCallback and LinqDataSource

I enable the EnableSortingAndPagingCallback on my GridView and using LinqDataSource.
Somehow after I tested, I always get error on deleting the row after move to the next page.

====
The solutions which work well is Use Update panel instead of EnableSortingAndPagingCallback.

I think it's better to use Update Panel rather then enableSortingAndPagingCallback, it some reason, it's faster and also include editing and deleting as well.

SWF Library to convert image

2008-10-13T00:30:00.000-07:00

I just find library to convert SWF to image. it's called SWFToImage.dll from bytescout.
but it is activeX. which we don't want to use.

and I find others called swfdotnet-1.0 but unfortunately, it only support swf version 7.

Any other library for this ?

Thanks.

LINQ will arround the DateTime.MaxValue

2008-10-13T00:26:00.001-07:00

Today, I just fixed the bugs which is interesting.

if we use linq to filter data with this DateTime.MaxValue.TimeOfDay.ToString();-
which will be appear show the time 23:59:59.9999999

Linq will add up to the next day.

so the solution never use the MaxValue.TimeOfDay.. just use simple string 23:59:59 and it's enough.

(o,o)

Firefox 3 - Caching ISSUE

2008-08-14T00:10:00.000-07:00

in Firefox 3 there is a weird bug which it somehow cache the page for no reason.
It just does not request to the server anymore... -(only if you update your updatepanel.

I have try many thing to avoid this.
1. Put meta tag which FF3 will ignore this -(
meta equiv="expires" content="Mon, 01 Jan 1990 00:00:00 GMT"
meta equiv="Cache-control" content="no-cache"
meta equiv="Cache-control" content="no-store"
meta equiv="Cache-control" content="must-revalidate"
meta equiv="pragma" content="no-cache"

2.Add Response Header - FF3 read this and by using Firebug, I notice that this info has been added to header
but it only worked in the first time, but after a while, it starts caching again.

Response.Cache.SetAllowResponseInBrowserHistory(false);
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();
Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches) ;
Response.Expires = 0;

=======
Desperately I find doggy solution to handle this.
1. I notice that if the query string is change, FF3 will not cache. so it still go back to the server.
just add ur querystring with DateTime.Now.TimeSpan.Tick at the back, and FF3 will not cache anymore.

2. go to about:config and disable browser.cache.disk.enable and browser.cache.memory.enable. But this is very doggy solution, you can't force all of user to disable there settings which is not default from FF3. - (So just ignore this solution)

======
More reference about this bug.
https://bugzilla.mozilla.org/show_bug.cgi?id=441751

https://bugzilla.mozilla.org/show_bug.cgi?id=327790#c8

http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.dotnet.framework.aspnet.caching&tid=6d5121f2-d78c-4e26-9d58-bbce507842b6&cat=en_US_f2b00e34-9211-4139-87be-4b28e2f0ef79&lang=en&cr=US&sloc=&p=1

http://www.alittlemadness.com/2008/07/30/ajax-vs-caching-vs-firefox-3/

http://www.killersites.com/mvnforum/mvnforum/viewthread?thread=11626

=====
Any other suggestion are welcome.

Force Page Client Validation First....

2008-07-29T07:17:00.001-07:00

Today, I need to force check if the Page is valid in the client to perform another javascript function called.

Luckily, If you use Script Manager, WebResources.axd has been provided a function.

This function called Page_ClientValidate which will return the boolean result which indicate if the page client is valid / not. This function also will so the error message from page client validator and summary validator.

validationResult = Page_ClientValidate("groupName");

However if you use validation which is happen on the server, you still to mark your button CausesValidation="true" (Default) and code behind to check if Page is valid.

Here is example server validator using Custom validator

<asp:CustomValidator ID="custVal" runat="server" Display="dynamic" OnServerValidate="custVal_ServerValidate">
*
</asp:CustomValidator>
//code behind validation
protected void sitevalName_ServerValidate(object source, ServerValidateEventArgs args)
{
     if (not valid)
          args.IsValid = false; 
}
//and don't forget in your button click code behind
//you need to check if page is valid,
//otherwise it will keep going.
if (!Page.IsValid) Return;

SWF with inside Modal Popup

2008-07-25T00:42:00.000-07:00

I just solve a problem with SWF inside Modal Popup.

The weird thing happen between SWF and Ajax. It sometimes work and not work.

To make show swf in IE , I need to use SWF Object to render.
var fo = new SWFObject('temp.swf', 'viewer', '100%', '100%', '7', '#ffffff');

but there is still problem in Firefox which sometimes load up sometimes not.

Finally I need to put it on other IFrame instead of div.

however It still cause a problem because I put the SWF Register Object using RegisterClient On backend... which Firefox does not accepted but IE accepted.

so Finally I need to put SWF object in front of Client aspx.

FingerMote

2008-07-18T00:13:00.001-07:00

Just find how your finger can do in WiiMote.
http://www.cs.cmu.edu/~johnny/projects/wii/

JQuery - Mouseleave VS Mouseout

2008-07-15T22:03:00.001-07:00

Today, I just realize that Mouseout will trigger if we go to the child of that container. Luckily JQuery has MouseLeave event which solve this problem.

Mouseover fires when the pointer moves into or out from child element, while mouseenter does't.

It is not standard DOM event so you need to use Bind method from JQUERY.

   $("div.overout").mouseover(function(){
     $("p:first",this).text("mouse over");
     $("p:last",this).text(++i);
   }).mouseout(function(){
     $("p:first",this).text("mouse out");
   });
   });

$("div.enterleave").bind("mouseenter",function(){
     $("p:first",this).text("mouse enter");
     $("p:last",this).text(++n);
   }).bind("mouseleave",function(){
     $("p:first",this).text("mouse leave");
   });

RepeatColumns in ListView

2008-07-15T00:45:00.001-07:00

The last major feature of the ListView is the ability to group data into subsets, much like the DataList control provides. The DataList is a tabular control that renders a single row of data in each cell of the rendered table. You control how many rows of the underlying dataset are grouped into a single table row by setting the RepeatColumns property.

Since the ListView is not constrained to render as a table, it needs a more generic way of specifying groups of items to be rendered together, which is what GroupTemplate does. Pic below shows the relationship among the LayoutTemplate, GroupTemplate, and ItemTemplate elements within a ListView. The GroupTemplate lets you specify the surrounding HTML for every n elements in the underlying dataset, where n is specified by the GroupItemCount property of the ListView.

When you use a GroupTemplate within a ListView, you won't specify a control with an ID of itemPlaceholder within your LayoutTemplate—that control now needs to be in your GroupTemplate. Instead, you will specify a control with an ID of groupPlaceholder in the LayoutTemplate (you can change the control ID by setting the GroupPlaceholderID property of the ListView) to describe where the contents of the GroupTemplate should be injected for each n items encountered in the underlying dataset.

Here is example how to use GroupTemplate in ListView

<asp:ListView ID="ListView1" runat="server" OnPagePropertiesChanging="ListView1_PagePropertiesChanging" GroupItemCount="2" DataKeyNames="CourtID">
   <LayoutTemplate>
       <asp:PlaceHolder id="groupPlaceholder" runat="server"/>
   </LayoutTemplate>
   <GroupTemplate>
       <table>
           <tr id="itemPlaceholder" runat="server">
           </tr>
       </table>
   </GroupTemplate>
   <ItemTemplate>
       <td>
           test<%# Eval("CourtID") %>
       </td>
   </ItemTemplate>
/asp:ListView>

This is very similar to what you could do with a DataList, but because you are working with a ListView, you can just as easily add both pagination and sorting as you did earlier with your grid rendering, a task that would be rather daunting with the DataList. The code download for this article contains an example that implements both pagination and sorting for your reference.

Data paging List View in .Net 3.5

2008-07-15T00:20:00.001-07:00

ListView is one of the new data controls that was shipped with the latest release of ASP.NET, which is 3.5. It displays the values from a data source by utilizing user-defined templates. This gives the developer more flexibility about the design of the data displayed on the user interface. In order for the ListView control to display its content, templates should be created for different parts of the control. The LayoutTemplate and ItemTemplate are mandatory. All other templates are optional.

Here is a sample to use Data paging without Data Source (Data Bind)

<asp:ListView ID="ListView1" runat="server" 
                            onpagepropertieschanging="ListView1_PagePropertiesChanging">
                            <LayoutTemplate>
                                LIST VIEW <br />
                                <table>
                                    <tr>
                                        <th>Court ID</th>
                                    </tr>
                                    <tr id="itemPlaceHolder" runat="server" />
                                </table>
                                
                            </LayoutTemplate>
                            <ItemTemplate>
                                <tr>
                                    <td>
                                      test<%   1: # Eval("CourtID")
%>
                                    </td>
                                </tr>
                                
                            </ItemTemplate>
                        </asp:ListView>
                        <asp:DataPager ID="DataPager1" runat="server" PagedControlID="ListView1" PageSize="3" >
                            <Fields>
                                <asp:NumericPagerField ButtonCount="4" />
                            </Fields>
                        </asp:DataPager>

//inside page load
protected void Page_Load(object sender, EventArgs e)
        {
            //nomd for the first time
            if (!IsPostBack)
            {
                ListView1.DataSource = CourtProvider.GetAllCourtsForDataBinding();
                ListView1.DataBind();
            }
        }

//when ListView Page Property Changed
protected void ListView1_PagePropertiesChanging(object sender, PagePropertiesChangingEventArgs e)
{
    DataPager1.SetPageProperties(e.StartRowIndex, e.MaximumRows, false);

    ListView1.DataSource = CourtProvider.GetAllCourtsForDataBinding();
    ListView1.DataBind();
    
}

Here is simple way to display using Object Data Source

<asp:ListView ID="ListView1" runat="server" DataSourceID="pdsData">
                            <LayoutTemplate>
                                LIST VIEW <br />
                                <table>
                                    <tr>
                                        <th>Court ID</th>
                                    </tr>
                                    <tr id="itemPlaceHolder" runat="server" />
                                </table>
                                
                            </LayoutTemplate>
                            <ItemTemplate>
                                <tr>
                                    <td>
                                      test<%   1: # Eval("CourtID")
%>
                                    </td>
                                </tr>
                                
                            </ItemTemplate>
                        </asp:ListView>
                        <asp:DataPager ID="DataPager1" runat="server" PagedControlID="ListView1" PageSize="3" >
                            <Fields>
                                <asp:NumericPagerField ButtonCount="4" />
                            </Fields>
                        </asp:DataPager>

<cc:ParentDataSource ID="pdsData" runat="server" SelectMethod="GetData" SelectCountMethod="GetDataRowCount" />

public IEnumerable<CourtBindingHelper> GetData(string sortExpression, int maximumRows, int startRowIndex)
       {
           try
           {

               return this.CourtsData.GetSortPagingData(sortExpression, maximumRows, startRowIndex);
               
           }
           catch (Exception ex)
           {
               lblError.Text = ex.Message;
               //if error just return the agencies
               return this.CourtsData;
           }
       }

       public int GetDataRowCount()
       {
           return (this.CourtsData != null ? this.CourtsData.Count : 0);
       }

Apple VS Orange

2008-07-11T00:31:00.001-07:00

http://www.yoho.cn/spaces/log/457532/

PEX

2008-07-09T22:44:00.001-07:00

Pex is Automated EXploration Testing. It is an intelligent assistant to the programmer and will help us to generate a prarameterized unit test.

very cool...

Do u want to become popcorn ?

2008-07-06T23:36:00.001-07:00

Trie Algorithm for Autocomplete and Suggest word

2008-06-12T18:30:00.001-07:00

Currently I try using Trie for Suggest and Autocomplete algorithm.

public List<string> Suggest2(string str)
{
    List<String> result = new List<String>();
    TrieNode curr = root;
    foreach (char c in str.Trim().ToLower().ToCharArray())
    {
        curr = curr.GetChild(c);
        if (curr == null)
            return result;
    }

    Suggest2(curr, new StringBuilder(str), result);
    return result;

}

public void Suggest2(TrieNode curr,StringBuilder sbTemp, List<string> result)
{
    if (curr == null) return;
    if (curr.IsEnd) result.Add(sbTemp.ToString());

    foreach (char c in curr.Childs.Keys)
    {
        sbTemp.Append(c);
        Suggest2(curr.Childs[c], sbTemp, result);
        sbTemp.Length--;
    }
}

Any Suggestion to improve this algorithm except changing String to StringBuilder ?

IDisposable Pattern in .NET

2008-06-06T20:08:00.001-07:00

In some cases we also need to implement IDisposable pattern in our code.

For example, If you have unmanaged objects such as (File, Image, TCP Connection, etc) or you want to make sure that you have closed your connection / web service.

Here is the code

#region IDisposable Pattern
        /// <summary>
        /// Desctructor in VB.NET - Finalize
        /// It will be called by Garbage Collector
        /// or you may force GC by calling GC.Collect()
        /// </summary>
        ~MyClass()
        {
            //only dispose unmanaged obj, for managed obj, 
            //it probably already been clear by GC, 
            //so we cannot called it again.
            Dispose(false);
        }
        /// <summary>
        /// Will be called when you use 'using' 
        /// keyword or implicitly called by you obj.Dispose()
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            //tell GC not to run Desctrutor, 
            //because it has been called implicitly
            GC.SuppressFinalize(this);
        }

        /// <summary>
        /// Dispose Unmanaged and manage
        /// </summary>
        /// <param name="bDisposeManaged">
        /// true - dispose unmanaged and managed code as well
        /// fase - dispose only and unmanaged
        /// </param>
        protected virtual void Dispose(bool bDisposeManaged)
        {
            try
            {
                if (bDisposeManaged)
                {
                    //TODO: dispose managed code 
                    //Such as(Service, connection, etc)
                    if (_ServiceUser != null)
                    {
                        try
                        {
                            _ServiceUser.Dispose();
                        }
                        catch { }
                    }
                }
                //TODO: dispose unmanaged code 
                //such as (File, Bitmap / Image, TCP Connection, etc)
            }
            catch{}
        }
#endregion

New Beta Sites

2008-05-30T01:06:00.001-07:00

Check this out...
www.evernote.com
This web site has OCR Build in which can search on handwriting inside your image

http://www.tripit.com/ - If you like traveling

Dynamic Data on ASP.NET 3.5 Extensions CTP

2008-05-29T21:39:00.001-07:00

I recently try Dynamic Data on ASP.NET 3.5 Extensions CTP.

The most thing that impress me is an idea of Dynamic Control /Field.

<asp:DynamicControl runat="server" DataField="EmailAddress"/>

So you can just simple define Dynamic Field in your Grid View and it will rendered into particular template (Include Edit Template) based on data type of your value.

You can define your template to have validation control or even can you 3rd party control such as telerik.

Here is How you can tell dynamic control to render based on particular template or even BLOB/Image Type as well.

//this is a partial class to override the code which has been generated by DBML
[MetadataType(typeof(MyClassMetadata))]
public partial class MyClass
{
    //TODO: You may put Validation when your data change or whatever...
}

//Here is your metadata which you will define rendering using UIHint
public class MyClassMetadata
{
    //Date Type
    [DisplayFormat(DataFormatString="{0:dd MMM yyyy}")]
    public object StartDate {get; set;}
    
    //Integer Type
    [Range(0,10, ErrorMessage="Please enter valid quantity between 1-10")]
    public object Quantity {get; set;}

    //Text type using 3rd Party WSYWIG control
    [UIHint("TextEditorTelerik")]
    public object Description {get; set;}

    //Blob - image type
    [UIHint("DbImage")]
    [ImageFormat(200,200)]
    public object Picture {get; set;}   
}

UIHint is where you define your template.

You can create whatever for your template name and just put "_Edit" for edit mode.

Just see the sample in under FieldTemplates of your Dynamic Data Project

Singleton Confusion

2008-05-29T21:05:00.001-07:00

I heard some developers asked about this question "If you can create a static class, Why do we need to create a Singleton Class ?"

I think the answer is straight forward.

Singleton Pattern is a pattern that will make sure there is only 1 instance. on the other hand It will make sure that developers will not be able to another instance.

Static Class will share your instance through your application. But this static class will not make sure that it will only be 1 instance of your class. Other developer which don't know where you put your static instance will able to create the new instance... and It will be any duplication and waste of resources.

Here is very simple Singleton pattern.

public class MySingleton
{
    //Your exclusive instance
    private static MySingleton _Instance;

    //this will make sure no one can create an instance of this class.
    private SampleSingleton(){}
    
    //this static constructor will be the only who can create an instance of this class
    static MySingleton()
    {
        //TODO: you may preinit / validation code before create an instance
        _Instance = new MySingleton();
    }

    public static MySingleton Instance
    {
        get{ return _Instance;}
    }
}

Who want to use Photosynth next ?

2008-05-22T17:41:00.001-07:00

Increase AJAX Performance by using Composite Script

2008-05-14T18:57:00.001-07:00

As you can see in Web Developer tool, there is a lot of request happening on the background.

The first thing you need to do before combining Ajax scripts, You need to know what scripts are being used by your pages.

Add this on your pages to detect what scripts are being used.

<microsoft:ScriptReferenceProfiler runat="server"/>

After that Copy all the Script References which is written by Script Reference Profiler.

And Paste it into Script Manager Composite Scripts.

<asp:ScriptManager runat="server">
   <CompositeScript>
       <!-- Paste Here -->
       <asp:ScriptReference name="~/Scripts/MyCustomScripts.js"/>
       <asp:ScriptReference name="MicrosoftAjax.js"/>
       <asp:ScriptReference name="MicrosoftAjaxWebForms.js"/>
       ....
       ....       
       <!--            -->
   </CompositeScript>
</asp:ScriptManager>

And as a results you can decrease the number of request and traffic for this scripts.

PS: The ScriptReferenceProfiler control is not part of the Beta installation, and you must install it separately. Download this http://www.codeplex.com/Release/ProjectReleases.aspx?ProjectName=aspnet&ReleaseId=13356.

Bug Fix For Unknown Runtime Error for Gridview inside Update panel

2008-05-07T01:45:00.001-07:00

If we use CSS Friendly,
This happen if I put GridView Under Update Panel without table.

But finally I found that in my master page there is this strange tag.
<a name="body" />

After remove this, Everything works fine.
Here is the reference.
http://damianpedwards.spaces.live.com/blog/cns!A079DE667E1958B3!562.entry

The most explanation that I found so far is this
=====From Lewis =====
http://cyrilgupta.com/wp/?p=110
I found that this error is caused by having a a html ‘form’ element somewhere inside the postback html.
After taking out the form tags (and any asp.net controls generating them) from the updatePanel’s contentTemplate, the error went away.
=====================

However , I still don't understand If I put your GridView outside update panel and keep EnableSortingAndPagingCallbacks="True"

When I click on Paging and Sorting, It throw error Microsoft JScript runtime error: 'panelElement' is null or not an object.

I think this is cause by CSS Friendly, because If I take the CSS Friendly out for GridView, It works fine
Any comment ?

LINQ to SQL Debugging

2008-05-06T20:59:00.001-07:00

There are several ways to debug your Linq to sql

Sql Server Profiler
But How about if you share your Sql Server with others such as staging DB ?
It will be nightmare.
DataContext Command
Console.WriteLine(ctx.GetCommand(prods).CommandText);
But How about if you don't want to write any debug code ?
LINQ to SQL Debug Visualizer
I think this is the best way to debug your LINQ to SQL.
You can use .NET Debugging Mode

And Click small magnifying glass in the expression above, It will launch the LINQ to SQL debug visualizer to inspect the raw SQL that the ORM will execute based on that LINQ query:

Click "Execute" button, you can even test out the SQL query and see the raw returned results that will be returned from the database:

Installing SQL debug Visualizer :

Download Linq to Sql Debug Visualizer http://www.scottgu.com/blogposts/linqquery/SqlServerQueryVisualizer.zip - (From Scott Gu Blog)
Copy from \SqlServerQueryVisualizer\bin\Debug\SqlServerQueryVisualizer.dll
Copy to C:\Program Files\Microsoft Visual Studio 9.0\Common7\Packages\Debugger\Visualizers

You may start debug your LINQ...

Custom CSS for Calendar Extender (AJAX Control Toolkit)

2008-04-29T18:21:00.001-07:00

You may specify your custom CSS for your calendar in your application.

Just put copy this style and change your custom style

For general Calendar

.ajax__calendar_container {padding:4px;position:absolute;cursor:default;width:170px;font-size:11px;text-align:center;font-family:tahoma,verdana,helvetica;}
.ajax__calendar_body {height:139px;width:170px;position:relative;overflow:hidden;margin:auto;}
.ajax__calendar_days, .ajax__calendar_months, .ajax__calendar_years {top:0px;left:0px;height:139px;width:170px;position:absolute;text-align:center;margin:auto;}
.ajax__calendar_container TABLE {font-size:11px;}
.ajax__calendar_header {height:20px;width:100%;}
.ajax__calendar_prev {cursor:pointer;width:15px;height:15px;float:left;background-repeat:no-repeat;background-position:50% 50%;background-image:url(<%=WebResource("AjaxControlToolkit.Calendar.arrow-left.gif")%>);}
.ajax__calendar_next {cursor:pointer;width:15px;height:15px;float:right;background-repeat:no-repeat;background-position:50% 50%;background-image:url(<%=WebResource("AjaxControlToolkit.Calendar.arrow-right.gif")%>);}
.ajax__calendar_title {cursor:pointer;font-weight:bold;}
.ajax__calendar_footer {height:15px;}
.ajax__calendar_today {cursor:pointer;padding-top:3px;}
.ajax__calendar_dayname {height:17px;width:17px;text-align:right;padding:0 2px;}
.ajax__calendar_day {height:17px;width:18px;text-align:right;padding:0 2px;cursor:pointer;}
.ajax__calendar_month {height:44px;width:40px;text-align:center;cursor:pointer;overflow:hidden;}
.ajax__calendar_year {height:44px;width:40px;text-align:center;cursor:pointer;overflow:hidden;}

.ajax__calendar .ajax__calendar_container {border:1px solid #646464;background-color:#ffffff;color:#000000;}
.ajax__calendar .ajax__calendar_footer {border-top:1px solid #f5f5f5;}
.ajax__calendar .ajax__calendar_dayname {border-bottom:1px solid #f5f5f5;}
.ajax__calendar .ajax__calendar_day {border:1px solid #ffffff;}
.ajax__calendar .ajax__calendar_month {border:1px solid #ffffff;}
.ajax__calendar .ajax__calendar_year {border:1px solid #ffffff;}

.ajax__calendar .ajax__calendar_active .ajax__calendar_day {background-color:#edf9ff;border-color:#0066cc;color:#0066cc;}
.ajax__calendar .ajax__calendar_active .ajax__calendar_month {background-color:#edf9ff;border-color:#0066cc;color:#0066cc;}
.ajax__calendar .ajax__calendar_active .ajax__calendar_year {background-color:#edf9ff;border-color:#0066cc;color:#0066cc;}

.ajax__calendar .ajax__calendar_other .ajax__calendar_day {background-color:#ffffff;border-color:#ffffff;color:#646464;}
.ajax__calendar .ajax__calendar_other .ajax__calendar_year {background-color:#ffffff;border-color:#ffffff;color:#646464;}

.ajax__calendar .ajax__calendar_hover .ajax__calendar_day {background-color:#edf9ff;border-color:#daf2fc;color:#0066cc;}
.ajax__calendar .ajax__calendar_hover .ajax__calendar_month {background-color:#edf9ff;border-color:#daf2fc;color:#0066cc;}
.ajax__calendar .ajax__calendar_hover .ajax__calendar_year {background-color:#edf9ff;border-color:#daf2fc;color:#0066cc;}

.ajax__calendar .ajax__calendar_hover .ajax__calendar_title {color:#0066cc;}
.ajax__calendar .ajax__calendar_hover .ajax__calendar_today {color:#0066cc;}

If you specify your CSS Class in calendar Extender, you may use this.

        <ajaxToolkit:CalendarExtender ID="customCalendarExtender" runat="server" TargetControlID="Date2"
           CssClass="MyCalendar" Format="MMMM d, yyyy" SelectedDate="April 28, 1906" PopupPosition="Left"/>

.MyCalendar .ajax__calendar_container {
    border:1px solid #646464;
    background-color: lemonchiffon;
    color: red;
}
.MyCalendar .ajax__calendar_other .ajax__calendar_day,
.MyCalendar .ajax__calendar_other .ajax__calendar_year {
    color: black;
}
.MyCalendar .ajax__calendar_hover .ajax__calendar_day,
.MyCalendar .ajax__calendar_hover .ajax__calendar_month,
.MyCalendar .ajax__calendar_hover .ajax__calendar_year {
    color: black;
}
.MyCalendar .ajax__calendar_active .ajax__calendar_day,
.MyCalendar .ajax__calendar_active .ajax__calendar_month,
.MyCalendar .ajax__calendar_active .ajax__calendar_year {
    color: black;
    font-weight:bold;
}

Multiple IE

2008-04-29T01:05:00.001-07:00

Running Multiple IE in your desktop is very useful for web tester.
Download Multiple IE installer (10.3MB)

MVP Pattern in ASP.Net

2008-04-28T01:18:00.001-07:00

why we need to use MVP ?

• No Code Reuse - Each view (page/control) must create an instance of a specific presenter in order to invoke the presenter's methods. That's four or five lines of code per page/control; quite a bit of work if you have hundreds of pages and controls in your site. Code can and should be centralized.
• Presenter Creation - Presenters operate on a specific type of interface. Generally speaking, there's a one-to-one relationship between presenters and interfaces. This problem relates to the "no code reuse" point, and leads to inconsistent public-facing functionality exposed by various presenters. Object creation should be standardized.
• View Intelligence – Using the MVP pattern forces a view to know as much about its presenter (methods, properties etc…) as the presenter knows about its view. The use of interfaces prevents a circular reference, but there should still be further decoupling of the view. One area I may disagree with Bill is that views should also not know what data layer type (or DAO interface type) to pass to a presenter. I'm of the opinion that the view's shouldn't have a reference to any data layer (i.e. anything upstream of the presenters).
• State Management – This one is a biggie. Many of the people posting on MVP are quick to point out that (very simple) MPV examples remove the ability for ASP.NET to use session and caching. How do you access context-specific information if presenters can't have a reference to anything downstream (i.e. System.Web or System.Windows.Forms)? The presentation layer should provide a way to maintain application state.

======================

Here is a basic Contact Us Web Form that we'll build with the MVP Pattern.

The first step of MVP is to create a contract. We're going to use a .Net Interface for that. Create a file called IContactUs.cs and use this code. This is our VIEW in the MVP.

public interface IReaderContactUs
{
    string Name { get; }
    string Email { get; }
    string PhoneNumber { get; }
    string Message { get; }
    string Result { set; }
}

The interface is like a blue print to a house. No implementation, just directions. This interface says that we have to be able to "GET" Name, Email, PhoneNumber, and Message. And that we have to be able to "SET" a Result string.

Next we need a Presenter. The presenter is the worker bee. The presenter actually does the work. Interestingly, the Presenter knows **NOTHING** about the UX. Repeat **NOTHING**. The presenter is usually in a different class library, and only referenced from the UX code. In order to enforce out contract (the .net interface we just created) we want to only be able to create a presenter, with an instance of the Interface. To do this, notice that our only constructor takes a single param that is the interface. Here is the code for our presenter; named ContactUsPresenter.cs

public class ContactUsPresenter
{
    private readonly IReaderContactUs view;

    public ContactUsPresenter(IReaderContactUs view)
    {
        this.view = view;
    }

    public void ProcessForm()
    {
        //do something - save it, send it, process it
        //in this case, just modify the UI, so we
        //know it's running. 
        //This is where you would normally make a call into the model

        StringBuilder sb = new StringBuilder();
        sb.Append(string.Format("Name : {0}<br />", view.Name));
        sb.Append(string.Format("Email : {0}<br />", view.Email));
        sb.Append(string.Format("Phone : {0}<br />", view.PhoneNumber));
        sb.Append(string.Format("Message : {0}<br />", view.Message));
        view.Result = string.Format("<h1>Success</h1>{0}<hr />", sb);
    }
}

Finally we get to the code behind of our Web Form. Our web form Implements the Interface. All this means is that our web form has to be able to "GET" Name, Email, PhoneNumber, and Message. And that we have to be able to "SET" a Result string. Notice the appropriate Get / Set routines that wrap around the asp.net server controls.

Notice that we have a private ContactUsPresenter, that doesn't get instantiated until the OnInit event. This is because we have to send in an instance of the interface, which is the this keyword. Then when the button is clicked, the presenter.ProcessForm(); is called to do the work.

public partial class ContactUs : UserControl, IReaderContactUs
{
    private ContactUsPresenter presenter;

    public string Name { get { return NameTextBox.Text; } }
    public string Email { get { return EmailTextBox.Text; } } 
    public string PhoneNumber { get { return PhoneTextBox.Text; } }
    public string Message { get { return MessageTextBox.Text; } }
    public string Result { set { ResultLabel.Text = value; } }
    
    protected override void OnInit(EventArgs e)
    {
        base.OnInit(e);
        presenter = new ContactUsPresenter(this);
    }

    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void SubmitContactButton_Click(object sender, EventArgs e)
    {
        presenter.ProcessForm();
    }
}

=========

You may need to check out MVP Pattern in Web Client Software Factory as well. This will give you a complete guidance to implement MVP Pattern in your web application

http://www.codeplex.com/websf/Wiki/View.aspx?title=MVP_landing_page&referringTitle=bundles

Object Dock

2008-03-26T15:58:00.001-07:00

Hi... I just find cool ... desktop tool... they called object dock. http://www.stardock.com/products/objectdock/

getYear() Javascript function in Firefox, IE, Safari

2008-03-23T20:10:00.001-07:00

Today, I just fix very common bug which only happened in Firefox and Safari.
The problem is very simple, when javascript called getYear() - it returns 108 in Firefox instead of 2008 in IE.

To resolve this , I just change getYear() into getFullYear() - it will return 2008 for all.
So.. Never use getYear() anymore... -)

Safari Runs Under Windows

2008-03-20T19:13:00.001-07:00

Today, I just get an Apple's update and It downloads Safari which is runs under my windows.

If you don't have Apple's - Click this Link http://www.apple.com/safari/download/

and It past ACID 2

Manage CSS in VS 2008

2008-03-17T14:49:00.001-07:00

VS 2008 supports a new tool window inside the IDE called "Manage Styles". This shows all of the CSS stylesheets, and their corresponding rules, for the page you are currently editing. It can be used both when you are in design-view, as well as when you are in source view on a page.

Click View > Manage Styles

A circle around a CSS rule in the manage styles window indicates that particular rule is in use within the current document. Using the mouse to hover over the rule allows you to quickly see the CSS rule values:

The tool window provides top level nodes for style block(s) in the current page and external style sheet in cascading order. Inline styles will not be displayed in this window, since inline styles are not “manageable”. Tool window will also list the @import directives.

The icons are used to differentiate the various types of styles as shown below.

Elements

Classes

IDs

Style in use (color applies as above)

You can then either right-click on a CSS rule and select "Modify Style" to bring up a graphical CSS rules editor, or you can double click on the rule in the manage styles window to automatically open the stylesheet file and jump immediately to the CSS source definition to edit (with full intellisense):

Click View > CSS Properties

One of the other cool new CSS features that is also supported in both design and source view is the new CSS Properties Window:

You can click on the individual values to see where in the CSS precedence hierarchy this value was inherited from or overridden. In the example below you can see that the final color for the current element that my cursor is on is a dark brown color. If I select this final color value, the CSS properties window will draw a blue box in the applied-rules list above indicating that this setting is set in the "singlecontent h3" rule:

If you click on the lighter brown color setting that this rule overrode (and which has the red strike-thru), you can see that it originated with the page's HTML body CSS rule (notice how the body rule below is selected in the applied rules list when you select the overridden value below):

Shelving your code in TFS

2008-03-14T18:19:00.001-07:00

TFS allows you to set aside pending changes in your TFS workspace if you want to work on something else for awhile, or if you want another coder to review your changes before you commit them, or if you want to pass off files you've been working on to another team member. When you create a shelveset TFS saves the items along with any associated Work Items or Check-in Notes to a separate repository, though not the source control repository itself.

Shelving a set of pending changes

In the Pending Changes view, click the down arrow icon and select Shelve.
In the Shelve - Source Files dialog box, type a name for your shelveset, any comments to help you remember the set, and, if necessary, deselect any file(s) you do not want to include in the shelveset. You can also associate a Work Item with your shelveset. For more information, see Associating Work Items with Changesets and Shelvesets.

Finding and Unshelving a set of pending changes

In the Pending Changes view, select the down arrow icon and click Unshelve.
In the Unshelve dialog type the name of any team member with a TFS workspace and click Find to retrieve a list of that team member's shelvesets. In the example below we are retrieving one of our own shelvesets, and selecting the one we created above. Click Unshelve.

Viewing Shelveset Details

To view details of a saved shelveset:

In the Unshelve dialog, after you have completed your search (Steps 1 -2 above), right-click a shelveset from the list and select Details.
In the Shelveset Details dialog, right-click a file and select from the popup menu. By selecting View, the shelved file opens in your Eclipse editor window where you can examine it before unshelving it. You also have the option to use the compare editor. For more information on this option, see Comparing versions .

File Upload AJAX V 1.2

2008-02-28T21:45:00.001-08:00

As you know that ASP.Net File Upload control can not be placed in multi view. If you put your file upload inside the multi view. You will lost your content when the multi view change the active view.

But the good news is there is Open source control called File Upload Ajax which in V1.2 can be placed inside Wizard, Multi View, invisible Panels, hidden divs, etc.

Download the control @ http://www.codeplex.com/fileuploadajax/Release/ProjectReleases.aspx?ReleaseId=8061

And try this.

Add your FUA in your project
Register in your page or in web.config

<%@ Register Assembly="FUA" Namespace="Subgurim.Controles" TagPrefix="cc1" %>

Add your Update panel, Multiview and file upload

<asp:UpdatePanel ID="up" runat="server">
    <ContentTemplate>
    <asp:MultiView ID="multiPages" runat="server" ActiveViewIndex="0">
        <asp:View ID="v1" runat="server">
        </asp:View>
        <asp:View ID="v2" runat="server">
            upload:
            <cc1:FileUploaderAJAX ID="FileUploaderAJAX1" runat="server" MaxFiles="1" Directory_CreateIfNotExists="true" File_RenameIfAlreadyExists="true"/>
        </asp:View>
    </asp:MultiView>
    </ContentTemplate>
</asp:UpdatePanel>

Add Code behind code

protected void Page_Load(object sender, EventArgs e)
{
    if (FileUploaderAJAX1.IsPosting)
    {
        HttpPostedFileAJAX pf = FileUploaderAJAX1.PostedFile;
        FileUploaderAJAX1.SaveAs("~/upload", pf.FileName);         
    }
}

Put ConfigSections on the top

2008-02-26T16:43:00.001-08:00

Today, I just find the problem why my code can not detect my custom config sections. because I put config sections after <AppSettings> -)

Use Ctrl + . to Resolve in VS2008

2008-02-26T16:42:00.001-08:00

Use Ctrl + . when you notice red underscore to Select a Resolve solution for you

Live Writer for Coder

2008-02-20T22:26:00.001-08:00

These are plugins which will help me to write better content

CodeSnippetSetup.msi - Wrap your code into a container
vspaste.msi - Copy paste from Visual studio

public static class HelloClass
{
    public static void HelloWorld()
    {
        //Hi I just found this plugin makes our live easier for writing a blog...
    }
}

Improve your AJAX Performance

2008-02-13T14:56:00.000-08:00

Just quick note what I just got this morning from RDN with Damian.

Disable compilation debug mode into false compilation debug="false"
- This will decrease the javascript code downloaded from ajax frameworks
If you don't use update panel, just using control toolkit,
disable partial rendering on Script Manager
EnablePartialRendering="false"
- This improve the process for common postback, without checking update panel
Try to saperate update panel as small as possible and put UpdateMode="Conditional".
this will not send back other update panel content on partial rendering.
By Default it sets to Always means it will send the content even not rendered.
For using Not friendly AJAX control such as Telerik, Reporting Services Viewer which can not use update panel to do partial postback.
You may put it into partial postback but add an attribute in Update Panel ChildrenAsTriggers="false". This will perform partial postback but not update your panel.

so to update another panel you can do manually __doPostback(%= ID%, ...) or just handle it in the control.

The ChildrenAsTriggers property determines whether postbacks from a child ontrol in an UpdatePanel result in its contents being refreshed. By default, this property is set to True and can be set to False only when the UpdateMode is set to conditional. Attempting to do so without this condition results in an InvalidOperationException being thrown by the ScriptManager during the page’s PreRender event.
In my experience I also turn off EnableViewState and It works fine, but I don't know if this improve the performance

And Don't forget to use Web Development Helper for IE , but before that you may need to install IE Developer tool
http://msmvps.com/blogs/paulomorgado/archive/2007/02/18/developer-tools-for-internet-explorer.aspx

KeyValueConfigurationElement VS NameValueConfigurationElement

2008-02-12T21:44:00.000-08:00

After checking on the description form MSDN, http://msdn2.microsoft.com/en-us/library/system.configuration.namevalueconfigurationelement(VS.80).aspx

It is written that
"
There is a difference between the NameValueConfigurationElement class and KeyValueConfigurationElement class. The NameValueConfigurationElement class does not require the first string to be unique, whereas KeyValueConfigurationElement class requires the first string to be a key, and therefore unique in the collection.
"

However when I try to test it, it seems that

NameValue also can not display duplicate Names in the collection moreover if the name is the same but the value is different , it will throw an error message which says that name has already has the value.
On the other hand KeyPair, also can not have duplicate keys but if there is duplicate key but different values, it will be override with the last values. There is no error message return.
KeyPair collection will be sorted , I guess it similar with Hashtable collection but NameValue is not sorted.
KeyPair is case sensitive so Key1 and key1 will be consider the same key
but Namevalue is incase sensitive Name1 and name1 will be consider different name

For solving this problem, I have build my custom collection - can be downloaded at
http://kkurni.googlepages.com/KKurni.CustomConfigurationElementCol.rar

IConfigurationSectionHandler is deprecated on .NET 2.0

2008-02-12T21:26:00.000-08:00

I just heard a bad news while reading MCTS Book and MSDN.

It said that IConfugurationSectionHandler is deprecated on .Net 2.0.

We need to inherits from ConfigurationSection instead of implementing IConfigurationSectionHandler.

Somehow it is easier using ConfigurationSection but it is less customization.

We can not have CDATA or text Element anymore. All value need to be placed on attribute.
Otherwise it will throw this exception
"The configuration section cannot contain a CDATA or text element."

If implementing IConfigurationSectionHandler we can easily using XmlElement Declaration . [XmlElement("ElementName")]
for multiple element values , We need to write ConfigurationElementCollection.

public class ValueCollection : ConfigurationElementCollection
{
protected override ConfigurationElement CreateNewElement()
{
return new ValueElement();
}

protected override object GetElementKey(ConfigurationElement element)
{
return ((ValueElement)element).Value;
}
}

public class ValueElement : ConfigurationElement
{
[ConfigurationProperty("value")]
public string Value
{
get { return (String)this["value"]; }
set { this["value"] = value; }
}
}

[ConfigurationProperty("domains")]
public ValueCollection Domains
{
get { return (ValueCollection)this["domains"]; }
}

Or you can use default configuration collection such as NameValueConfigurationCollection or KeyValueConfigurationCollection

But If using IConfigurationSectionHandler we can just use XmlElementAttribute
[XmlElement("ExtractColumn")]
public ExtractColumn[] ExtractColumns;

====================
However The nice thing of using ConfigurationSection is

Standard .Net Configuration
Easier to validate and better error Messages
[ConfigurationProperty("myAttrib1", DefaultValue = "test", IsRequired = true)]
[StringValidator(InvalidCharacters = "~!@#$%^&*()[]{}/;'\"|\\", MinLength = 1, MaxLength = 60)]

MVC Framework for ASP.NET is coming

2008-02-10T18:08:00.000-08:00

From my previous blog, I just read that Microsoft will provide MVC Framework for AsP.Net Developer.

Here is the good link for MVC Framework
http://weblogs.asp.net/scottgu/archive/2007/10/14/asp-net-mvc-framework.aspx

MVC VS MVP vs Passive View

2008-02-06T17:12:00.000-08:00

As you know MVC is a Model View Controller Pattern. which focus on the controller to update the view trigger by event when model changed/ updated.

MVP is the variation of MVC where controller can hang together with View (Called Presenter).
This makes the UI more interactive. such as in Asp.net control, user can interact with the model interactively using the presenter.

Passive view is also the variation of both. It will enhance the testability. It does not have dependencies with View and Controller and all user responses are handled by the controller

Free sorting with CSS Friendly and Object Datasource

2008-02-06T16:34:00.001-08:00

I just find a good article where you can implement sorting and paging easily using object data source.

Object data source will not do binding everytime postback anymore and It instantiate inside your page control.
http://damianpedwards.spaces.live.com/blog/cns!A079DE667E1958B3!567.entry#post

All the presentation is implemented using CSS Friendly.
http://damianpedwards.spaces.live.com/blog/cns!A079DE667E1958B3!562.entry

Trigger Javascript inside Ajax Partial Postback called

2008-02-05T16:42:00.001-08:00

To run / trigger a javascript after ajax partial postback, We need to register our script in our code behind.

Here is the code :
//To find your script manager which belong to master pages
ScriptManager sm = Master.FindControl("ScriptManager1") as ScriptManager;

ScriptManager.RegisterStartupScript(this, this.GetType(), "title script", string.Format("javascript:window.open(\"{0}\",\"_blank\");", "kajaxnet.blogspot.com"), true);

Dig into Data Source

2008-02-04T21:14:00.000-08:00

Data Source (Object Data Source and Sql Data Source) in .net 2.0 includes free sorting and paging. Here is a very good example the benefit of using data source.
http://damianpedwards.spaces.live.com/blog/cns!A079DE667E1958B3!562.entry

Using Data Source we can use CSS friendly to structure and display our sorting and paging nicely.

However there is overhead when you implementing AJAX type of work.

DataSource will trigger your select method, everytime, it is postback.
If you use Data binding using data table / other data source , you can control manually so that it only bind when you need to refresh your data or there is data changes.
Object Data Source is isolated from your page control. because It create a new instance of data source every time it postback. so you can not share your data into your page control. If you want to share you need to share it using session/ cache. View state/ class variable can not be shared.

Dynamically sorting your data easily using Linq & Lamda

2008-02-04T21:08:00.000-08:00

Here is 1 line of code to sort data dynamically based on sorting parameter A

YourProducts.OrderByDescending(p => p.GetType().GetProperty(A.GetValue(c,null))

It will get your property value of Product class dynamically.

Here are some example to use lamda expression in C# 3.0:

x => x + 1 // Implicitly typed, expression body

x => { return x + 1; } // Implicitly typed, statement body

(int x) => x + 1 // Explicitly typed, expression body

(int x) => { return x + 1; } // Explicitly typed, statement body

(x, y) => x * y // Multiple parameters

() => Console.WriteLine() // No parameters

TFS vs Others

2008-02-03T20:56:00.000-08:00

Here is some of the features that I found in TFS but not in other version controls (CVS and SVN)

Rename - It will automatically rename your file without removing from CVS / SVN.
Probably, Visual SVN also has this feature, But I never test it.
When Adding a project into source controls, It will efficiently exclude the bin folder and other files that will dynamically created. This will make source control very efficient. On the other hand, if using CVS/ SVN, you need to exclude the bin folder manually.

TFS knows .net source files better than other source control.
TFS has integrated with VS nicely. more than Visual SVN.
TFS has integrated with Development Pattern methodology such as MSF Agile and CMMI
More over you can add your custom development pattern and process.
It integrate with Sharepoint portal which enhance the functionality as document management and documentation process such as WIKI and Blogs.

TFS on VS 2008 Beta 2 - Adding a lost files

2008-02-03T20:46:00.000-08:00

After playing around with TFS on VS 2008, I found a difficulties to add a new file which I have created outside VS 2008.

In another scenario may happen if you want to recover unintentionally delete and at the same time merge with the previous version.

Somehow, It displays an error after I merge my lost file which says that I need to choose the server version or my version. But I does not have an option to do that.

However after fiddling with it for 1 hour, Finally I found the easiest way to dealing with those issues.

In source control , Right Click on directory which contains your new file or file that you want to recover.
select Compare.
TFS will list all new files or lost files and you can easily added into your source control.

Load Testing on AJAX Application

2008-02-03T20:38:00.000-08:00

Sometimes we need to perform a web test and load test for AJAX Application especially in partial postback.

VS 2005 Test edition / Team System provides a functionality to perform a web test. However the limitation is , it can not capture a partial postback.

For that reason we need one of the web capture tool called fiddler to capture all ajax request and response and we save it as Visual studio web test. and After that we can perform our ajax Load Test using VS 2005 Test edition / Team system.

Here are the steps

Before we perform load test, we need to create a web test first.

You may create multiple web tests to perform different scenario test cases.

In order to test an AJAX, you need to capture using Fiddler.

Here are the steps:

Open Fiddler application.
Open Internet Explorer and perform a scenario of your test. Fiddler will automatically log your request and response even for partial Post back /AJAX
Select All fiddler capture session responses and requests
On Fiddler menu File>Save>Session(s)>as Visual Studio Web Test
Import this web test into your VS Test project.
And it's ready to perform load test by creating a load test file inside VS

Note: You may set a windows credential in your web test.

There is an icon on the top tool bar of your web test.

Silverlight 2.0 is coming

2008-01-31T22:14:00.000-08:00

Silverlight 2.0 is coming. It' s originally called Silverlight 1.1. I don't why they changed the name into 2.0. rrr....

The cool thing in Silverlight 2.0 is :

Include CLR as .Net Framework 3.0 (so you can use code behind in Vb.net / C#
Base Class Library (BCL) provides classes for collections, reflection, regex, string handling, data access
Dynamic Language runtime in media files
The first available languages written for the DLR are Iron Python 2.0 and Managed JScript.
Microsoft is also building Iron Ruby and Dynamic Visual Basic (VBx) languages.

Conversely, other .NET languages must be compiled ahead of time and delivered to Silverlight as .NET assemblies. The implementation of Managed JScript conforms to the ECMA Script 3.0 specification, and Microsoft claims that it is 250 times faster than interpreted JScript.
http://weblogs.asp.net/scottgu/archive/2007/05/07/silverlight.
Extensible controls
XML Web Services - Data access over XML-based Web Service and WCF ( POX, REST, JSON )
Networking
LINQ API ( full support for LINQ to Objects and Expression Trees)
WPF model (Shapes, document, media and animation objects)

Limitation:

The current release, the UI controls do not have support for databinding to any data source. But, Microsoft has clarified that the limitations are due to this being an early preview release. Future releases will add more than 20 UI controls add two-way databinding support, and automated layout management as well as data manipulation controls such as data grid.
http://blogs.msdn.com/somasegar/archive/2007/11/29/quick-update-on-silverlight.aspx

Deferred Execution in LINQ

2008-01-30T15:04:00.000-08:00

To boost the performance in Linq deferred execution, Linq has provided a nice method
called ToArray() and ToList()

By using those method, you just need to execute query into database once and iterate locally through your array or list.

Hibrenate - Lazy Initialization (could not initialize proxy - the owning session was closed)

2008-01-30T14:55:00.000-08:00

Hibernate object relational mapping offers both lazy and non-lazy modes of object initialization. Non-lazy initialization retrieves an object and all of its related objects at load time. This can result in hundreds if not thousands of select statements when retrieving one entity. The problem is compounded when bi-directional relationships are used, often causing entire databases to be loaded during the initial request. Of course one could tediously examine each object relationship and manually remove those most costly, but in the end, we may be losing the ease of use benefit sought in using the ORM tool.

Hibernate proxies can be very handy if you have performance concerns, the idea is to load the objects lazily as proxies and never hit the database. The proxies are initialized meaning fetched from the database when they are first accessed, however life is not so easy:) Whether there is a configured filter-interceptor of spring to manage hibernate sessions or you manually take care of the session’s life cycle, once the session was closed, the proxies attached to that will lead to a proxy initialization error if they are accessed later.

The reason is tricky, a hibernate session is created and some data is loaded to the session as a proxy, later the session is closed without an access to the proxy occurred. Then proxy is decided to be used and accessed, at this point one may get the error “no session or session was closed” since the session which the proxy is attached is “closed”. In order to deal with this situation there are some solutions.

1) Reloading the proxy “before” using it in the new session, this will attach the new proxy to the new session.

2) Using static method Hibernate.initialize(obj) before the owning session was closed, this will hit the db and replace the proxy with the actual data.

3) Using a Session lock via Session.lock(obj,lockmode), this will reattach the proxy to the new session.

4) Or you just disable lazy initialization mode by mark the flag into false (lazy=false)

As you see this proxy business isn’t simple as it seems but I belive once you learn how to use them they are the best way to optimize the performance.In the end who has not the need for speed?

Abstract VS Interface

2008-01-07T18:45:00.000-08:00

multiple inheritance
INTERFACE-A class may implement several interfaces.
ABSTRACT-A class may extend only one abstract class.

default implementation
INTERFACE- cannot provide any code at all, much less default code.
ABSTRACT- can provide complete code, default code, and/or just stubs that have to be overridden.

is-a vs -able or can-do
INTERFACE- are often used to describe the peripheral abilities of a class, not its central identity, e.g. an Automobile class might implement the Recyclable interface, which could apply to many otherwise totally unrelated objects.
ABSTRACT-defines the core identity of its descendants. If you defined a Dog abstract class then Datamation descendants are Dogs, they are not merely dog able. Implemented interfaces enumerate the general things a class can do, not the things a class is.

plug-in
INTERFACE- You can write a new replacement module for an interface that contains not one stick of code in common with the existing implementations. When you implement the interface, you start from scratch without any default implementation. You have to obtain your tools from other classes; nothing comes with the interface other than a few constants. This gives you freedom to implement a radically different internal design.
ABSTRACT-You must use the abstract class as-is for the code base, with all its attendant baggage, good or bad. The abstract class author has imposed structure on you. Depending on the cleverness of the author of the abstract class, this may be good or bad.

homogeneity
INTERFACE- If all the various implementations share is the method signatures, then an interface works best.
ABSTRACT-If the various implementations are all of a kind and share a common status and behaviour, usually an abstract class works best. Another issue that’s important is what I call "heterogeneous vs. homogeneous." If implementors/subclasses are homogeneous, tend towards an abstract base class. If they are heterogeneous, use an interface. (Now all I have to do is come up with a good definition of hetero/homo-generous in this context.) If the various objects are all of-a-kind, and share a common state and behavior, then tend towards a common base class. If all they share is a set of method signatures, then tend towards an interface.

maintenance
INTERFACE- If your client code talks only in terms of an interface, you can easily change the concrete implementation behind it, using a factory method.
ABSTRACT- Just like an interface, if your client code talks only in terms of an abstract class, you can easily change the concrete implementation behind it, using a factory method.

adding functionality
INTERFACE- If you add a new method to an interface, you must track down all implementations of that interface in the universe and provide them with a concrete implementation of that method.
ABSTRACT- If you add a new method to an abstract class, you have the option of providing a default implementation of it. Then all existing code will continue to work without change.

JBOSS for .Net Issue (505)

2008-01-03T15:37:00.000-08:00

JBOSS has known issue when talking to .NET Client.

You will receive this error.
The request failed with HTTP status 505: HTTP Version Not Supported.

This error happened because .NET does not implement HTTP 1.1 properly (specifically contiuations), therefore the only way you can fix this is to force the client to use HTTP 1.0.

You can enable in on Server Side / Client side.

On Server Side:
adding the following option (in bold) to your http connector tag in your tomcat server.xml file.
Connector port="8080" address="${jboss.bind.address}"
maxThreads="250" strategy="ms" maxHttpHeaderSize="8192"
emptySessionPath="true"
enableLookups="false" redirectPort="8443" acceptCount="100"
restrictedUserAgents="^.*MS Web Services Client Protocol.*$"
connectionTimeout="20000" disableUploadTimeout="true"

On Client Side:
Change .NET webservice to use HTTP 1.0 by adding the following code to your proxy class.

 protected override System.Net.WebRequest GetWebRequest(Uri uri)
        {
            HttpWebRequest httpReq = (HttpWebRequest)base.GetWebRequest(uri);            
            httpReq.ProtocolVersion = System.Net.HttpVersion.Version10;
            return httpReq;
        }

Debugging into System Code

2008-01-03T15:13:00.000-08:00

I just find that we can not debug into system generated code because by default "Just My Code" is enabled.....

To be able to debug a system generated code such as proxy/wsdl... you need to disable "Just My Code" inside debugging options.

Steps:
* Tool>Options>Debugging>General
* Untick Enable Just My Code (Managed Only)....

Enhance Data View Performance using Asynchronous Method

2007-12-30T16:41:00.000-08:00

Currently I find a way how to enhance a performance to view 10.000 records which taken from Web service layer.

First of all, I can not using any caching because this data will change very often.
Every time the user change something, I need to refresh the data.

I can not use Sql Dependency because all the data are encapsulate on service layer.
I can not perform paging on service layer because it is not provided to me.

Finally, the only way is using Asynchronous Method.

The idea is to display the first page of the records and start retrieving others data asynchronously.

The next time the user want to perform, sorting, filtering or paging, It will force to finish all retreiving data.

This algorithm will force using user thinking time in retreiving huge records rather than forcing user to wait retrieving huge records every time even they just want to see the first page records.

Here is the Algorithm:
=================================
If ( ! IsPostback)
{
* Clear Data set from session
* Retrieve 1st page only and bind to data grid with next/previous paging style
* Create a delegate to retrieve the rest of data
* Start asynchronous call with BeginInvoke.
* Store that delegate and IAsynResult into session.
}
else
{ //( Postback) and user try to bind a data (Sorting, Paging, Filtering)
If (There still no data set in Session)
{
* Take delegate and IAsynResult
* Force delegate to finish by using EndInvoke(IAsynResult)
* Store the data set into Session.
* Bind to data grid with default paging style.
}
else
{
* directly use data set from session and bind to data grid with default paging style.
}
}
===============================

Note:
You may optimize this algorithm by getting a number of record first.
If the number of records is less or equal then the number of first page records, just store that data into session and bind it to data grid with default paging style.
You don't need to perform asynchronous call for this.

The only weakness of this methodology is it will be more thread in your application.

Notify your custom application from CRM 3.0

2007-12-16T21:54:00.000-08:00

This is one of the solution how you notify your application from Microsoft Dynamic CRM 3.0

1. Add Javascripts to notify your application from CRM Custom forms.
a. Open CRM 3.0

b. Go To Settings/ Customization

c. Select what entity you need ( Example phone, email, ...)

d. Go to forms and view on the left tab after you open your entity

e. Select the forms you want to add the scripts.

f. click add properties.

g. There is 2 available event handler (OnSave and OnLoad)

h. Put your javascript there
for example : window.opener('Notify on save');

i. Don't forget to check enable this event before you save it.

j. You may preview it before publish the changes.

g. Don't forget to publish - Action/Publish.

If you forget to publish, It will not take any changes you have made, even you have save it.

Better way to handle thread abort exception in Response.Redirect

2007-12-14T18:59:00.000-08:00

private bool m_bIsTerminating = false;

protected void Page_Load(object sender, EventArgs e)
{

if (WeNeedToRedirect == true)
{

Response.Redirect(url, false);
HttpContext.Current.ApplicationInstance.CompleteRequest();
m_bIsTerminating = true;
// remember to end the method here if
// there is more code in it
return;

}

}

protected override void RaisePostBackEvent(IPostBackEventHandler sourceControl, string eventArgument)
{

if (m_bIsTerminating == false)

base.RaisePostBackEvent(sourceControl, eventArgument);

}

protected override void Render(HtmlTextWriter writer)
{

if (m_bIsTerminating == false)

base.Render(writer);

}

Datagrid VS ViewState

2007-11-16T15:20:00.000-08:00

This week, I try to optimized my web application which using 10 million record.

The first thing that I notice that EnableViewState by default is set to true.

So my datagrid will store all the view state into client. so every time there is postback or asyn postback, it will transfer heaps of data through networks. and It is not very efficient.

So I try to disable them by EnablingViewState = false.
However by disabling view state in the data , all the events in datagrid is not fired..

one of the solution is to disable view state on each item.
_dg.DataBind();
foreach (DataGridItem item in _dg.Items)
{
item.EnableViewState=false;
{

however, if your all commandArguments is not work,..

so the other solution is you need to bind every time in page back...

Resurrection

2007-11-06T18:56:00.000-08:00

Just in case if you don't know.

Sometimes it is you may need to resurrects your object.
for example you want the object to clean itself gracefully everytime the object dies.

Here how to do resurrection....

public class MyBaseClass
{
Protected override void Finalize()
{
//TODO: Some Clean up....

GC.ReRegisterForFinalize(this);
}
}

By calling GC.ReRegisterForFinalize method, it will appends the address of the specified object to the end of the finalization queue. When GC detects that this object is unreadchable again, It will queue the object's pointer ob the freachable queue and Finalize method will get called again.

This is example show how to create an object that constantly resurrects itself and never dies...
which usually undesireable. It is far more common to conditionally set a root to a reference the object inside the finalize method.

Sys.WebForms.PageRequestManagerParserErrorException

2007-10-30T22:04:00.000-07:00

“Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.”

this is the most annoyed error , That I ever had.

It happens only the first time after I restart my web application / after change web.config.

I still keep getting that error even I have try to alter my code based on this
--------------------------------------------------------------------------------------

Calls to Response.Write():
Place an or similar control on your page and set its Text property. The added benefit is that your pages will be valid HTML. When using Response.Write() you typically end up with pages that contain invalid markup.
Response filters:
The fix might just be to not use the filter. They're not used very often anyway. If possible, filter things at the control level and not at the response level.
HttpModules:
Same as response filters.
Server trace is enabled:
Use some other form of tracing, such as writing to a log file, the Windows event log, or a custom mechanism.
Calls to Server.Transfer():
I'm not really sure why people use Server.Transfer() at all. Perhaps it's a legacy thing from Classic ASP. I'd suggest using Response.Redirect() with query string parameters or cross-page posting.

Another way to avoid the parse error is to do a regular postback instead of an asynchronous postback. For example, if you have a button that absolutely must do a Server.Transfer(), make it do regular postbacks. There are a number of ways of doing this:

The easiest is to simply place the button outside of any UpdatePanels. Unfortunately the layout of your page might not allow for this.
Add a PostBackTrigger to your UpdatePanel that points at the button. This works great if the button is declared statically through markup on the page.
Call ScriptManager.RegisterPostBackControl() and pass in the button in question. This is the best solution for controls that are added dynamically, such as those inside a repeating template.

-------------------------------------------------------

After I give up... The only solution is to add enableEventValidation="false" in the Page attribute.

Probably it is not the best solution because the event validation mechanism reduces the risk of unauthorized postback requests and callbacks. When the EnableEventValidation property is set to true, ASP.NET allows only the specific events that can be raised on the control during a postback request or callback. In this model, a control registers its events during rendering and then validates the events during postback or callback handling.

However after debugging I relies that It throw that error after I write into a session which I never write anything in the beginning. which cause the event validation not valid

So another solution is if EnableEventValidation is so important then
put it back EnableEventValidation = true then
in your Page_Load Event,
put
----------------------
Session["something"] = true; in your page load event.

This will create the cookie needed for the session variable to work, and therefore anything using a session will also work without throwing the error.

---------------------

This solution needed if there is no session ha s been initialize but when there is asynchronous postback, you put a session and EnableEventValidation is true

The Simplest Javascript to convert to hexadecimal in Javascript

2007-10-29T22:33:00.001-07:00

function toHexa(d) {return d.toString(16);}

function toDec(h) {return parseInt(h,16);}

As Keyword in C#

2007-09-22T05:37:00.000-07:00

The "as" keyword in C# attempts to cast an instance to a specific type and if it fails returns null.

What is the different between explicitly cast ?

string str = (string) Request["nullSession"];
string str = Request["nullSession"] as string;

Both of them return the same (NULL)...

However probably, I will stick with my casting style because
1. It confused me when I need to convert from C# to VB
2. I can not using as keyword to replace
(int) 123.23 where I expect to get 123 as integer

----
123.21 as int
//throws The as operator must be used with a reference type ('int' is a value type)

123.21 as int16
//throws The as operator must be used with a reference type ('short' is a value type)

123.21 as double
//throws The as operator must be used with a reference type ('double' is a value type)

JSON AJAX Localization

2007-09-08T07:14:00.000-07:00

It may be annoying when you need to have several languages in your web sites..

There is several way... to implement localization your web content in the client..

you either create a control and attached those assembly to your web site...
or just use... JSON object...

My preference is using JSON ( Javascipt Object Notation)....

* Create.. JSON Resource JS file for each.. languange...
Resource.js
MyReourceText={
"HeaderTitle":"Hello World",
"FooterText":"CopyRight By Kurniawan"
}

Resource.fr.js
MyReourceText={
"HeaderTitle":"Header Title in France",
"FooterText":"CopyRight By Kurniawan in france"
}

* Create.. UpdateResource js - this script will update your content use specific localize language.
Note:
-saperate this file from Resource.js...so you will not duplicate your code

UpdateResource.js
Sys.Application.add_load(SetupForm);
function SetupForm()
{
$get('HeaderTitle').innerText = MyReourceText.HeaderTitle;
$get('FooterText').innerText = MyReourceText.FooterText;
}

* In your aspx... add enable EnableScriptLocalization="true" in your ScriptManager
This will enable the

* Add those script reference into your script Manager
<asp:ScriptReference Path="Resource.js" ResourceUICulture="fr" />
<asp:ScriptReference Path="UpdateResource.js" />

**** THAT'S ALL ****

You may change your language from the browser or
from the your own control.... by using this...
System.Threading.Thread.CurrentThread.CurrentUICulture =
System.Globalization.CultureInfo.CreateSpecificCulture(cmbLang.SelectedValue);

and you can get the current language from your browser when not postback
cmbLang.Items.FindByValue(System.Threading.Thread.CurrentThread.
CurrentUICulture.TwoLetterISOLanguageName).Selected = true;

****

You may enable globalization.. to formating your date / currency into specific languange../ culture...

by activate EnableScriptGlobalization = "true" in Script Manager...
You can use
d.localeFormat("dddd, dd MMM yyyy");

****

XAML ???

2007-09-06T17:14:00.000-07:00

X A M L ??? (ZAMMEL) Yes, That's the correct spelling...

It extends for Extendsible Application Markup Language.
ZAMMEL is Xml based language to define object and their properties ...

It focused on UI for WPF/E (Windows Presentation Foundation/Everywhere)

You may check out Silverlight to begin with XAML.

Here is the Zammel Sample
<object>
<child property="x" property="y">
<child.property>
<class property="u" property="v"/>
</child.property>
</child>
<child>
</child>
</object>

Note:
* Xaml is different with WPF - Xaml is Xml based Markup
WPF is a graphics API

* XAML also supports things like 3D and controls, which SVG does not. It's different from SVG

* Saparate Design and Development

F# ???

2007-09-06T17:04:00.000-07:00

F# -
Functional language ???
Why do we need to learn that language ???

So far I know... this language is meant to be more mathematical at heart, and thus creates more separation between the lower level machine details and the developer's code.

functional programming is supposed to be a "higher level" of programming than Java or C.

#light
(* Sample Windows Forms Program *)

(* We need to open the Windows Forms library *)
open System.Windows.Forms

(* Create a window and set a few properties *)
let form = new Form(Visible=true, TopMost=true, Text="Welcome to F#")

(* Create a label to show some text in the form *)
let label =
   let temp = new Label()
   let x = 3 + (4 * 5)
   (* Set the value of the Text*)
   temp.Text <- x
   (* Remember to return a value! *)
   temp

(* Add the label to the form *)
do form.Controls.Add(label)

(* Finally, run the form *)
do Application.Run(form)

Generic.Dictionary Serializable ?

2007-09-06T16:37:00.000-07:00

so far I know that Generic.Dictionary is not serializable by default in .Net 2.0

One of the implication is when you put your dictionary in the session of Asp.net...
You will get problem... You will get an error when serializer run and
try to get your session ship out of your web service....

Here is the code... to

using System;

using System.Collections.Generic;

using System.Text;

using System.Xml.Serialization;

[XmlRoot("dictionary")]

public class DictionarySerializable

: Dictionary, IXmlSerializable

{

#region IXmlSerializable Members

public System.Xml.Schema.XmlSchema GetSchema()

{

return null;

}

public void ReadXml(System.Xml.XmlReader reader)

{

XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));

XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));

if(reader.IsEmptyElement) return;

reader.Read();

while (reader.NodeType != System.Xml.XmlNodeType.EndElement)

{

reader.ReadStartElement("item");

reader.ReadStartElement("key");

TKey key = (TKey)keySerializer.Deserialize(reader);

reader.ReadEndElement();

reader.ReadStartElement("value");

TValue value = (TValue)valueSerializer.Deserialize(reader);

reader.ReadEndElement();

this.Add(key, value);

reader.ReadEndElement();

reader.MoveToContent();

}

reader.ReadEndElement();

}

public void WriteXml(System.Xml.XmlWriter writer)

{

XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));

XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));

foreach (TKey key in this.Keys)

{

writer.WriteStartElement("item");

writer.WriteStartElement("key");

keySerializer.Serialize(writer, key);

writer.WriteEndElement();

writer.WriteStartElement("value");

TValue value = this[key];

valueSerializer.Serialize(writer, value);

writer.WriteEndElement();

}

#endregion

}

Get bored with Web Service ???

2007-09-06T06:11:00.000-07:00

Are you get bored with Web Service Technology ?

Yeah... Probably... It has been too old for us....

Check it out Microsoft Astoria - Data Service....
http://astoria.mslivelabs.com

You may try to deploy your database into Web Data Service

It is also supported by ASP.NET Futures (May 2007)

Iron Phyton with ASP.Net Futures

2007-09-06T05:26:00.000-07:00

Here is the example... how to nice it is using Iron phyton to filter your Grid View which generated from DynamicList

* Restrict your column...
def GetColumns() :
return ["Column1","Column2",....]

* Add your custom column
def GetColumns() :
return ["Column1","Column2",....
["My Custom Column", lambda: "%s (%s)" % (Column3, Column4)]
]

* Rule level formating for your view
From System.Drawing import Color
def InitRow(row):
if "myKeyword" in Column1 :
row.BackColor = Color.Green

How easy it is ????

Dynamic Data Component in ASP.NET Futures

2007-09-06T05:20:00.000-07:00

These are the details of Dynamic Data Components , If you want to play around with the code...

* DynamicAutoData - It will build the presentantion of your tables
Master, Detail, Insert RSS Links

* DynamicList - Build Grid View for your table

* Dynamic Details - Build the details for your master tables...

* Dynamic Insert - Build the insert new data form for your table...

* Dynamic Rss Link - Burn your page into.. RSS feed

* Dynamic Filter - Filter.. your table...

Codeless in .Net Futures

2007-09-06T05:07:00.000-07:00

Please Check out this...
It's amazing, You don't need to write anything to View all your database through .Net Futures...

* Create Web Site with DynamicDataWebSite Template...

* Add your Database into APP_Data

* Open your web.config

1. Enable showAllTables by change false into true
<dynamicDataControls showAllTables="true" >

2. and uncoment auto.axd inside httpHandlers

---- That's ALL --------------------------

All has been build for you
* List all of your tables
* Master Detais
* Insert Update Delete
* RSS Links....

What else do you need?

Embed your javascript file into single DLL

2007-09-05T05:55:00.000-07:00

If you want your javascript hidden or secure inside the dll...

Please see this step... to embed your javascript file (*.js) into your dll.

Go to the property of the javascript file (Right Click in *.js file)
Change Build Action to Embeded Resource (Default is content)

Go To AssemblyInfo.vb (Turn on Show All file to see that file)
Add <AssemblyL System.Web.
UI.WebResource("YourNameSpace.YourJSName.js", "application/x-Javascript")>

Register to Page control.Page.ClientScript.RegisterClientScriptResource
(typeOf(yourClassName),"YourNameSpace.YourJSName.js");

OR if available

Register to AjaxToolkit.ScriptManager using Reflection

System.Type _ScriptManager = Type.GetType
("System.Web.UI.ScriptManager , System.Web.Extension");

if (_ScriptManager == null)
throw new Exception(" Use... the other register above");

System.Reflection.MethodInfo _RegisterClientScriptResourceMethod =
_ScriptManager.GetMethod("RegisterClientScriptResource",new Type()
{typeof(System.Web.UI.Control), typeof(Type), typeof(System.String)} );

_RegisterClientScriptResourceMethod.Invoke(Nothing, new Object()
(this,typeOf(yourClassName),"YourNameSpace.YourJSName.js");

Building your own Ajax

2007-09-05T05:47:00.000-07:00

So far, I know there is 3 Tutorials which good to see before you build your own control...

The best one is using AjaxToolkitTemplate-Extender...
See - AjaxToolkit Documentation on the left bottom corner.
According to me.. this Ajax design is easy to use and very consistet with ajaxToolkit...

However.. there is another... Video Tutorial can be found in the www.asp.net/learn/ajax

"WinVideo-ASP-AjaxCustomAjaxControl" - Build User Control embeded into single dll
"WinVideo-ASP-AjaxEnableYourCustomControl" - Build Web UserControl in different DLL

Ajax Service Method

2007-08-25T08:01:00.001-07:00

1. Create web service with [System.Web.Script.Services.ScriptService()] attribute in class level

2. add Service Reference... in service manager

asp:ServiceReference Path="MyAjaxService.asmx"

3. Add javascript method

function Bt1_OnClick()
{
MyAjaxService.SayHello("Kurniawan",OnComplete,OnError);
}

function OnComplete(result)
{
alert("OnComplete : " + result);
}

function OnError(result)
{
alert("OnError : " + result._message);
}

using AjaxPro2.dll from Michael Schwarz

2007-08-23T20:33:00.000-07:00

*Add web Config configuration/configSections

section name="ajaxSettings" type="AjaxPro.AjaxSettingsSectionHandler, AjaxPro.2"

*Add web Config configuration/system.web/httpHandlers
add verb="*" path="ajaxpro/*.ashx" type="AjaxPro.AjaxHandlerFactory, AjaxPro.2"

*add reference AjaxPro2.dll into the bin folder
using AjaxPro;

* in page load (postback and not) - add
Utility.RegisterTypeForAjax(typeof(_Default));

*On client ajax method add attribute
[AjaxMethod(HttpSessionStateRequirement.ReadWrite)]
public string MyAjaxMethod(string username)
{
return "Halo" + UserName;
}

*call in client javascript
_Default.MyAjaxMethod("Kurniawan").value