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Editorial Team
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Asked: 2026-05-30T23:12:32+00:00

I just installed the MVC 4 Beta now my MVC 3 application does not

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I just installed the MVC 4 Beta now my MVC 3 application does not compile with the following error:

The type ‘System.Web.Mvc.ModelClientValidationRule’ exists in both ‘c:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies\System.Web.Mvc.dll’ and ‘c:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v2.0\Assemblies\System.Web.WebPages.dll’ C:\Users\michaeljo\Documents\src\patientgive\Phc.Mvc\Infrastructure\PasswordStrengthAttribute.cs

It would appear this has been moved to a different assembly and since both assemblies are in the GAC it does not know which to use.

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1 Answer

  1. Editorial Team

    After installing MVC4 beta today, a few of my MVC 3 projects would not compile. (ModelClientValidationRule conflict) The fix was:

    Edit:

    ProjectName.csproj

    Change 

    <Reference Include="System.Web.WebPages"/>

    To

    <Reference Include="System.Web.WebPages, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL "/>
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