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copied!<blockquote> <p>This particular exception is very common and can be caused by any one of the following:</p> <p><strong>1. Calls to Response.Write():</strong> By calling Response.Write() directly you are bypassing the normal rendering mechanism of ASP.NET controls. The bits you write are going straight out to the client without further processing (well, mostly...). This means that UpdatePanel can't encode the data in its special format.</p> <p><strong>2. Response filters:</strong> Similar to Response.Write(), response filters can change the rendering in such a way that the UpdatePanel won't know.</p> <p><strong>3. HttpModules:</strong> Again, the same deal as Response.Write() and response filters.</p> <p><strong>4. Server trace is enabled:</strong> If I were going to implement trace again, I'd do it differently. Trace is effectively written out using Response.Write(), and as such messes up the special format that we use for UpdatePanel.</p> <p><strong>5. Calls to Server.Transfer():</strong> Unfortunately, there's no way to detect that Server.Transfer() was called. This means that UpdatePanel can't do anything intelligent when someone calls Server.Transfer(). The response sent back to the client is the HTML markup from the page to which you transferred. Since its HTML and not the special format, it can't be parsed, and you get the error.</p> </blockquote> <p><strong>Complete Post :</strong> <a href="http://www.andornot.com/about/developerblog/2007/07/aspnet-ajax-and-syswebformspagerequestm.aspx" rel="nofollow noreferrer">ASP.NET AJAX and Sys.Webforms.PageRequestManagerServerErrorException</a></p> <p>You can grab the code which causes the error by using Visual Studio Debug feature. I don't know much but maybe it can help and also Firebug will help you to see server response and data you submit to the server.</p> <p>Here is a video where you can see how to use Firebug to debug Ajax. <a href="http://encosia.com/2009/09/21/updated-see-how-i-used-firebug-to-learn-jquery/" rel="nofollow noreferrer">See how I used Firebug to learn jQuery</a></p> <p>But I don't think Asp.NET Ajax should be avoided in heavy loaded pages. That is actually what Ajax stands for right ? I mean it also relieves servers to send small pieces of pages instead of requesting the whole page again.</p>

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