Book excerpt: This book explains how to use the ASP.NET AJAX features to create richer, more responsive dynamic websites. It explains the architecture, including the ASP.NET server elements and the client-side Javascript library, and runtime. The book will walk you through examples for each feature element, demonstrating how the client and server interact to produce a better web application. The book also progresses in a way that educates you on how ASP.NET and AJAX build on each other to provide a comprehensive framework for rich application development.