Here is a simple Chat application to demonstrate the use of XMLHttpRequest (AJAX) in ASP.NET. This is a one to one user chat application, but can be easily extended to support multi user chat also.

DatabaseScript.sql
AjaxChat
........\AjaxChat.csproj
........\App_Data
........\........\SecureChat.mdf
........\........\SecureChat_log.LDF
........\bin
........\...\SecureChat.dll
........\...\SecureChat.pdb
........\Default.aspx
........\Default.aspx.cs
........\Default.aspx.designer.cs
........\Global.asax
........\Global.asax.cs
........\images
........\......\add.gif
........\......\alert.gif
........\......\bc.gif
........\......\bg-box-body.gif
........\......\bg-box-body.png
........\......\bg-box-bottom.gif
........\......\bg-box-bottom.png
........\......\bg-box-top.png
........\......\bl.gif
........\......\black_arrow.png
........\......\black_arrow_bottom.png
........\......\br.gif
........\......\button.gif
........\......\button_hover.png
........\......\close.gif
........\......\delete.gif
........\......\dialog-error.png
........\......\dialog-help.png
........\......\dialog-warning.png
........\......\info.gif
........\......\msg.gif
........\......\sprite.gif
........\......\user.gif
........\js
........\..\alertbox.js
........\..\GeneralScripts.js
........\..\jquery-ui.css
........\..\jquery-ui.min.js
........\..\jquery.easing.1.3.js
........\..\jquery.min.1.4.js
........\..\jquery.min.js
........\..\jquery.tools.min.js
........\..\style.css
........\..\Window.js
........\..\WindowStyles.css
........\Login.cs
........\MessageCommunicator.js
........\Messages.cs
........\Properties
........\..........\AssemblyInfo.cs
........\SecureChat.csproj.user
........\SecureChatServer.ashx
........\SecureChatServer.ashx.cs
........\Users.cs
........\Web.config
AjaxChat.sln

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