GAC Conflicts with ASP MVC

By some strange combination of beta and pre-release candidate installs I managed to create some serious conflicts with ASP.NET MVC. Thereby producing this wonderful little error:

Compiler Error Message: CS0433: The type 'System.Web.Mvc.FormMethod' exists in both 'c:\WINDOWS\assembly\GAC_MSIL\System.Web.Mvc\\System.Web.Mvc.dll' and 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\06c0b3cf\32bec25d\assembly\dl3\71bfb65b\e11bf5c5_9e55c901\System.Web.Mvc.DLL'

I am using my own build of the source from codeplex so that I can debug through it to improve my knowledge of the codebase. From research online it looks like the assembly version between the latest pre-release and the beta weren’t incremented, or the web-runner tries to look in the GAC before the /bin, or the evil garden gnomes are at it again, or Microsoft wants to punish me for building THEIR dll files.

To solve this problem, i opened up the AssemblyInfo.cs files of the Mvc project and upped the AssemblyVersion to Then hacked my web config to use that version. As I’m running in debug mode, and can’t sign the assembly I also had to remove the PublicKeyToken from the reference.

<add assembly="System.Web.Mvc, Version=, Culture=neutral"/>

And suddenly we’re back in business.

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