Unable to cast object of type 'X' to type 'X' - ASP.NET

Question

I am currently working with a ASP.NET Web site project in Visual Studio 2008 and everytime I make a change to code behind page for a user control and browse to page that is using the user contorl I get the following error:

Unable to cast object of type 'ASP.basepage_master' to type 'ASP.basepage_master'.

I have to rebuild my entire solution to order to resolve this error. Has anyone else experienced this error and do they know how to resolve it?

Answer 1

Deleting your temporary ASP.NET files (everything in C:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files) makes this go away... for a while.