Xmlhttp achieved through a chat room without refresh. asp.net

xmltalk聊天室
.............\SimpleChat
.............\..........\App_Data
.............\..........\bin
.............\..........\...\SimpleChat.dll
.............\..........\...\SimpleChat.pdb
.............\..........\...\Utility.dll
.............\..........\...\Utility.pdb
.............\..........\css.css
.............\..........\Default.aspx
.............\..........\Default.aspx.cs
.............\..........\Default.aspx.designer.cs
.............\..........\js
.............\..........\..\Ajax.js
.............\..........\..\Common.js
.............\..........\..\Default.js
.............\..........\..\Include.js
.............\..........\MsgList.cs
.............\..........\obj
.............\..........\...\Debug
.............\..........\...\SimpleChat.csproj.FileList.txt
.............\..........\Properties
.............\..........\..........\AssemblyInfo.cs
.............\..........\Receive.aspx
.............\..........\Receive.aspx.cs
.............\..........\Receive.aspx.designer.cs
.............\..........\SimpleChat.csproj
.............\..........\SimpleChat.csproj.user
.............\..........\Web.config
.............\SimpleChat.sln
.............\Utility
.............\.......\bin
.............\.......\...\Debug
.............\.......\Caching.cs
.............\.......\Fetch.cs
.............\.......\obj
.............\.......\...\Debug
.............\.......\...\Utility.csproj.FileList.txt
.............\.......\Properties
.............\.......\..........\AssemblyInfo.cs
.............\.......\Utility.csproj

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