asp.net and ajax

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ASP.NET

hi,
i m new in ajax ,and getting these msg at the time of saving data-
Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.

hi
i read that ,but i m not using
1)Response.Write()
2)server.transfer
3)Remove httpmodule from web.config file
4)how to disable server trace
5)and not using response filters