首先Web.Config 中配置成:

..............







  1. <httpHandlers>  
  2.  <remove verb="*" path="*.asmx"/>  
  3.  <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>  
  4.  <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"/>  
  5.  <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"/>  
  6. </httpHandlers>  
  7. <compilation debug="true">  
  8. <assemblies>  
  9.  <add assembly="Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>  
  10. </assemblies>  
  11. </compilation>   


重新编译,运行即可.


如果配置Web.Config后运行仍然报错误,请将所有页面的中的 <asp:ScriptManager id="ScriptManager1" runat="server" AsyncPostBackTimeout="200">

</asp:ScriptManager>

紧跟在<Form>标记之后.