说明：  本卷从最易于理解和使用的部分入手，介绍ASP.NET AJAX框架中能够与传统ASP.NET无缝对接的服务器端部分，包括服务器端ASP.NET AJAX Extensions与ASP.NET AJAX Control Toolkit。这部分内容不需要读者任何的客户端开发知识，只要在Visual Studio中拖拖拽拽即可实现强大的客户端Ajax功能，例如局部页面更新、异步回送、拖拽、动画等，非常适合为现有的ASP.NET 2.0应用程序添加少量的Ajax特性，或是基于ASP.NET 2.0的一些简单Ajax功能的实现。
(The present volume, from the most easy to understand and use some to start, introduce the framework of ASP.NET AJAX can be docked seamlessly with the traditional ASP.NET server-side part, including the server-side ASP.NET AJAX Extensions and ASP.NET AJAX Control Toolkit. This part of the contents of readers do not need any client-side development of knowledge, as long as the Visual Studio drag drag drag can realize powerful Ajax client-side functions, such as partial page updates, asynchronous loopback, drag and drop, animation and so on, very suitable for the existing ASP.NET 2.0 application to add a small amount of Ajax features, ASP.NET 2.0 or based on some simple Ajax functionality realized.)