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problem with ajax control while upgrading website from 3.5 to 4.0 frame work

Posted By:      Posted Date: October 01, 2010    Points: 0   Category :ASP.Net


i am working on asp.net website.

on my web page i  submit some data on click at button , this block is inside update panel.

this functionality working fine in 3.5 frame work.

Now  our website is using 4.0 frame work.

controls inside update panel giving following error on submting data :

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500.

 thanks in advance

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