解决在使用Ajax控件时出现的"Sys未定义"

1.安装ASPAJAXExtSetup.msi，把

AJAXExtensionsToolbox.dll
System.Web.Extensions.Design.dll
System.Web.Extensions.dll

这三个dll文件放到bin文件夹下面

2.在配置文件webconfig中加入:

<httpHandlers>
<remove verb="*" path="*.asmx"/>
<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
</httpHandlers>


3.<asp:SrciptManager> 控件一定要紧跟在<form>后面