After we update the website to .Net Framework 3.5(System.Web.Extensions 3.5.0.0, System.Web.Extensions.Design 3.5.0.0)

I found out the CE got error message when the page is using AJAX Controls.

 

Microsoft JScript 執行階段錯誤(Excuting Error):

Sys.WebForms.PageRequestManagerServerErrorException: 不允許篩選(Can not filter)。

 

after remove the CE control

the AJAX Page run correctly.