• Microsoft
  • JQuery min (<script src="http://ajax.microsoft.com/ajax/jquery/jquery-1.3.2.min.js" type="text/javascript"></script>)

  • <script src="http://ajax.microsoft.com/ajax/beta/0909/MicrosoftAjax.js" type="text/javascript"></script>

  • <script src="http://ajax.microsoft.com/ajax/beta/0909/MicrosoftAjaxTemplates.js" type="text/javascript">

    • http://ajax.Microsoft.com/ajax/jQuery/jquery-1.3.2.js
    • http://ajax.Microsoft.com/ajax/jQuery/jquery-1.3.2.min.js
    • http://ajax.Microsoft.com/ajax/jQuery/jquery-1.3.2-vsdoc.js
    • http://ajax.Microsoft.com/ajax/jQuery/jquery-1.3.2.min-vsdoc.js

             Source: http://www.asp.net/ajax/cdn/

• Google
  • JQuery min(<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" type="text/javascript"></script>)
  • JQuery (<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js" type="text/javascript"></script>)
  • JQuery UI min(<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.min.js" type="text/javascript"></script>)
  • JQuery UI(<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.js" type="text/javascript"></script>)

      http://code.google.com/p/jqueryjs/downloads/detail?name=jquery-1.3.2-vsdoc2.js

There are many reason that I do not know why the Visual Studio IDE decides not to allow this set of controls to be added to its Toolbox menu, but I know the answer to one of those reasons which is:

Try to remove any reference to the Ajax Controls library in your Web.Config file inside the <Pages> >> <Controls> tags, if exists. Anyhow it worked for me.

1. Implement ASP.NET AJAX with the UpdatePanel control
2. Creating a Simple ASP.NET Page with Multiple UpdatePanel Controls
3. UpdatePanel Tips and Tricks
4. ScriptManager Enables AJAX In Your Web Apps
5. Drag and Drop with ASP.NET AJAX
6. New AJAX Support For Data-Driven Web Apps
7. AJAX Application Architecture, Part 1
8. AJAX application architecture, Part 2
9. Managing the User Experience in AJAX
10. Lazy Loading the ASP.NET AJAX TabContainer Control 
11. More Sample AjaxControlToolkit TabContainer Themes
12. ASP.NET AJAX TabContainer – Tips and Tricks 
13. How To: Lazy-load TabPanel's within the AjaxControlToolkit's TabContainer Control
14. Delay Load an UpdatePanel
15. Customize Controls with AJAX Extenders
16. Modal Dialog Boxes with AJAX
17. Drag and Drop with ASP.NET AJAX
18. Creating Sophisticated Animations with the Microsoft AJAX Library
19. ASP.NET AJAX Extender for multicolumn drag and drop
20. The Ever-Useful $get and $find ASP.NET AJAX Shortcut Functions
21. Documentation for: ASP.NET Ajax Version Ajax 1.0,  MSDN1 & MSDN2
22. Delayed Content Loading Using the AJAX.NET Timer and UpdatePanel
    
23. ASP.NET/ AJAX Page Loader Progress Bar/ Splash Screen
    

1. ASP.NET Custom Error Pages
2. Error Handling in ASP.Net Ajax Applications
3. Handling exceptions in ASP.NET Ajax
4. Asp.net Ajax Exception Logging
5. How to improve ASP.NET AJAX error handling
6. Asynchronous error handling change in ASP.NET AJAX 3.5
7. ScriptManager - AsyncPostBackErrorMessage Property
8. Tip/Trick: Handling Errors with the UpdatePanel control using ASP.NET AJAX
9. Error Handling in ASP.NET
10. Sys.WebForms.PageRequestManagerParserErrorException - what it is and how to avoid it
11. Configuring Visual Studio to Debug .NET Framework Source Code
12. ELMAH: Error Logging Modules and Handlers for ASP.NET (and MVC too!)

To show a message box from the ASP.NET page code behind, we could try to ways:

1. When no Ajax is used:

   • Response.Write("<script>alert('The Class has been created.');</script>");

2. When Ajax is used:

   • ScriptManager.RegisterStartupScript(this, this.GetType(), "Key", String.Format("alert('The {0} Class has been approved.');", Detail.Title), true);