How to understand Microsoft AJAX Library basics

Microsoft ASP.NET is a free technology that allows programmers to create dynamic web applications. ASP.NET can be used to create anything from small, personal websites through to large, enterprise-class web applications. All you need to get started with ASP.NET is the free .NET Framework and the free Visual Web Developer. Specifically, this tutorial addresses the use of the Microsoft AJAX client-side javascript libraries. For more information, or to get started using Microsoft AJAX Library, take a look.