Microsoft ASP.NET AJAX documentation includes overviews, tutorials, and API reference topics. We suggest the following progression of documentation to help you to get started.

Getting Started	Overview Installing ASP.NET AJAX Sample ASP.NET AJAX Application Introduction to the UpdatePanel Control Introduction to the UpdateProgress Control Introduction to the Timer Control
ASP.NET AJAX Server Controls	UpdatePanel Control Overview The UpdatePanel Control UpdateProgress Control Overview The UpdateProgress Control Timer Control Overview The Timer Control ScriptManager Control Overview
Client Scripting	Extending JavaScript with ASP.NET AJAX Creating Custom Client Script in ASP.NET AJAX Embedding a JavaScript File as a Resource in an Assembly Embedding Localized Resources for a JavaScript File
Debugging and Tracing	ASP.NET AJAX Debugging and Tracing Overview
Web Services	Asynchronous Communication Layer Overview Exposing Web Services to Client Script Calling Web Services from Client Script ASP.NET Application Services
Localization and Globalization	Localizing Resources for Component Libraries Overview Globalizing a Date by Using Client Script Embedding Localized Resources for a JavaScript File
Extending ASP.NET AJAX	Creating Custom ASP.NET AJAX Non-Visual Client Components Creating Custom ASP.NET AJAX Client Controls Creating an Extender Control to Associate a Client Behavior with a Web Server Control Adding Client Capabilities to a Web Server Control

Documentation for: ASP.NET Ajax Version 1.0

ASP.NET AJAX Roadmap

Introduction