Recently I came across a problem where my aspx page was throwing an exception
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.
Details: Error parsing near’
after some googling found following article by Eilon Lipton
While goin through this article the reason why I was getting that exception.
Actually I has a page which had an UpdatePanel and a ASP Button control on clicking of which I wanted to load another aspx page in the same masterpage. for this what I was using Server.Transfer, which was actually causing the problem. After I replaced the Server.Transfer with Response.Redirect. I got through and it saved lots of my time.