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Editorial Team
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Asked: 2026-05-28T03:06:46+00:00

So i am working on ASP.NET project. I was trying to debug a wierd

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So i am working on ASP.NET project. I was trying to debug a wierd issues that I couldn’t figure out. I decided to download source code for MVC and debug with that. Here is what happened.

  1. I downloaded and compiled the mvc solution from codeplex.
  2. I removed reference to MVC from my own project and added a reference to the source code csproj file
  3. Meanwhile I figured out what was actual issues so decided to go back and remove source code csproj file.
  4. I added back C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies\System.Web.Mvc.dll in reference

Now when I try to run project I get following error. I deleted and renamed root folder under c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files, but when I run project this folder get created again and complaint about the same error.

c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\037dc5b9\7cd3238e\App_Web_logon.cshtml.9cf88e2b.y6cgf4sv.0.cs(41): error CS0433: The type ‘System.Web.Mvc.WebViewPage’ exists in both ‘c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\037dc5b9\7cd3238e\assembly\dl3\527f6213\51a90210_63d1cc01\System.Web.Mvc.DLL’ and ‘c:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.Web.Mvc\v4.0_3.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll’

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1 Answer

  1. Editorial Team

    Deleting the bin folder solved the problem. Apparently doing a “Clean Solution”/”Rebuild solution” did not remove system dlls (for good reasons I think). Anyways thanks for those who commented on my question.

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