Getting the Sys.WebForms.PageRequestManagerParserErrorException while making an AJAX callback

Recently I encountered an issue wherein our customer was running into a client side AJAX exception, Sys.WebForms.PageRequestManagerParserErrorException, while trying to make an Async Postback from an ASPX page. This exception was happening for all the clients in a specific network and looked like this: ————————— Microsoft Internet Explorer ————————— Sys.WebForms.PageRequestManagerParserErrorException: The message received from the…

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Fix: UpdatePanel Async Postbacks Slow in Internet Explorer

We’ve seen a few issues recently where customers were experiencing very slow async postbacks via an UpdatePanel, but only in Internet Explorer. Other browsers worked fine. (When I say “very slow”, I mean in the neighborhood of 30 seconds!) The cause for this isn’t a mystery to us. Because of the way our HTML viewer…

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<location> Tag Causes Local Automatic ASP.NET debugging not to work in Visual Studio

This week I got an interesting issue altogether. One of my customers was unable to debug ASP.NET 3.5 application locally using Visual Studio 2008. The application was created using Web Application Project. When we started the application using "Start Debugging (F5)", page came up fine but debugger was not getting attached to process. In Visual…

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