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Editorial Team
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Asked: 2026-05-11T20:28:53+00:00

Trying to debug into ASP.NET MVC 1.0 source, I followed instructions like these ,

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Trying to debug into ASP.NET MVC 1.0 source, I followed instructions like these, basically remove reference to system.web.mvc from my web project and add the source project I downloaded instead.

Now, I have this problem,

The type ‘System.Web.Mvc.FormMethod’
exists in both
‘c:\Windows\assembly\GAC_MSIL\System.Web.Mvc\1.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll’ and in my AppData\Local\Temp\Temporary
ASP.NET
Files\root\dbcbb149\897fc019\assembly\dl3\796c00fb\f345f2d6_abe3c901\System.Web.Mvc.DLL’

I tried commenting out the following from web.config

<add assembly="System.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />

but it’ll give a difference error

The type ‘System.Web.Mvc.Controller’
is defined in an assembly that is not
referenced. You must add a reference
to assembly ‘System.Web.Mvc,
Version=1.0.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35’.

Could someone help on what’s going wrong and how to fix it. Thank you very much!

Ray.

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1 Answer

  1. Editorial Team

    There is no need to uninstall ASP.NET MVC from GAC! (or any any <assemblyBinding>s) Just follow “Using the ASP.NET MVC source code to debug your app” article step by step.

    There are a couple of questions similar to yours:

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