我的第一个chat room 是用ASP 3.0写的。 程序比较简单，两个text box， 用来处理页面上每秒刷新的信息。那时候，要想建一个真正的chat room，要用到Java Applet 或者 ActiveX control。基于HTTP的chart rooms都面临着一些跟我第一个chat room一样的问题。这些问题包括页面刷新导致的屏幕闪烁现象。但这个问题已经被AJAX解决了。 AJAX是Javascr ipt和 XML异步调用的结合。现在在server端用一些Javascr ipt代码就可以实现一个真正的chat room了。这篇文章不会介绍Ajax，并假设你已经对Ajax和ASP.NET的运用有一定了解。只是介绍如何用Ajax技术来创建一个基本的chat room。

-My first is a chat room with ASP 3.0 writes. Procedures are relatively simple, two text box, used to handle pages of information per second set. At that time, if we want to build a real chat room, have to use Java applet or ActiveX control. Based on the chart HTTP rooms are faced with something like my first one chat room asked the same issue. These issues include pages to refresh the screen flicker. However, this problem has been solved AJAX. AJAX is Asynchronous Javascr ipt and XML called the combination. Now the server side using some Javascr ipt code can achieve a real chat r the oom. This article will introduce Ajax, and the assumption that you have to Ajax and ASP.NET use a certain understanding. Only how to use Ajax technology to create a basic chat room.