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ASP.NET AJAX is a free framework for quickly creating a new generation of more efficient, more interactive and highly-personalized Web experiences that work across all the most popular browsers.
ASP.NET AJAX allows the developer to create web applications in ASP.NET 2.0 (and to a limited extent in other environments) which can update data on the web page without a complete reload of the page (a “round trip” to the server). The key technology which enables this functionality is the XMLHttpRequest object, along with Javascript and DHTML.

ASP.NET AJAX Introduction

• ASP.NET AJAX Overview
• ASP.NET AJAX 1.0 Released
• Perspectives on ASP.NET AJAX
  
• ASP.NET AJAX Extensions
• Enhance your Website with ASP.NET AJAX Extensions
• AJAX-enable an Existing ASP.NET Web Page
• Getting Started with AJAX 1.0
• A Technical Look at ASP.NET AJAX

ASP.NET AJAX Tutorials and Articles

• ASP.NET AJAX Official Tutorials and Documentations
• Videos on “How Do I?” with ASP.NET AJAX by Joe Stagner
• ASP.NET AJAX under the hood secrets By Omar Al Zabir
• Build Google IG like Ajax Start Page in 7 days using ASP.NET Ajax and .NET 3.0
• Consuming Web Services With ASP.NET AJAX
• ASP.NET AJAX Control Development
• DotNetNuke 4.5 and ASP.NET AJAX
• ASP.NET AJAX in Mono/Grasshopper
• Integrating ASP.NET AJAX with SharePoint
• An Introduction to AJAX Techniques and Frameworks for ASP.NET
• ASP.NET Ajax Grid and Pager
• Dragging and dropping with ASP.NET 2.0 and Atlas
• Debugging ASP.NET AJAX
• Sample Ticker Application To Integrate WPF/E and ASP.NET AJAX
• Developing ASP.NET AJAX Repeater
• How to create an HTML Editor for ASP.NET AJAX
• Introduction of ASP.NET AJAX Toolkit – CollapsiblePanel

ASP.NET AJAX Sites

• Microsoft ASP.NET AJAX Official website
• AJAX Control Toolkit

ASP.NET AJAX Blogs

• ASP.NET AJAX Team Blogs
• Jim Zimmerman
• Mike Ammerlaan’s Blog
• Nikhil Kothari’s Weblog
• Michael’s Blog
• Damian Mehers Blog

ASP.NET AJAX Controls and Toolkits

• AJAX Control Toolkit – is a joint project between the community and Microsoft. Built upon the ASP.NET 2.0 AJAX Extensions, the Toolkit aims to be the biggest and best collection of web-client components available.
• Ajax Data Controls – The purpose of this project is to Develop data controls such as GridView, DataList, Repeater, DetailsView, FromView, ObjectDataSource on top of Microsoft Ajax Framework for Client Centric Development model.
• Ajax Sprite Toolkit – is a collection of ASP.NET AJAX Controls and Behaviors that aid in the development of 2D sprite based games that run in a web browser.
  
• ASP.NET AJAX Control Set (AjaxSet) – is a project to build AJAX control and extender library. Currently only the first one control is in package Validator Extender. More controls to come. If you want to contibute feel free to contact me.
• GSAjaxControls – General & Specialized AJAX Controls built on top of the AJAX Control Toolkit and ASP.Net AJAX 1.0

ASP.NET AJAX Resources

• ASP.NET AJAX Learning Guide
• Microsoft Ajax Library Cheat sheet
• Official Asp.net Ajax Forum
• Dotnetslackers Atlas Forum
• ASP.NET AJAX Control Toolkit – ASP.NET Forums
• Asp.Net Ajax Resources, Links and Documentation

ASP.NET AJAX Downloads

• ASP.NET Extensions v1.0
• ASP.NET AJAX Documentation
• ASP.NET AJAX Control Toolkit
• Microsoft AJAX Library
• ASP.NET AJAX Source Code
• Expression Web - Trial
• Visual Web Developer Express – Free
• ASP.NET Futures
• ASP.NET AJAX Sample Applications
• Screencast: Introduction to AJAX, ASP.NET AJAX and the AJAX Control Toolkit

See Also;

1. AJAX Frameworks and Resources
2. What is Microsoft Silverlight? Silverlight Resources, Articles and Tutorials
3. SQL Injection Resources
4. Prevent robots from submitting data
5. Frameworks are more important than Programming Languages
6. Programming Handbooks and Cheatsheets