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Editorial Team
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Asked: 2026-06-18T08:35:51+00:00

I downloaded source code of example written in asp.net mvc3 visual studio 2010 Open

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I downloaded source code of example written in asp.net mvc3 visual studio 2010

Open solution file by visual studio 2012. It coverts source code to 2012 and opens solution.

When I build solution got error:

Error 1 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:\studyCode\MVCDemo-Part12\MVCDemo-Part12\MVCDemo\Attributes\Validation\EqualAttribute.cs 54 28 MVCDemo

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  1. Editorial Team

    Just delete System.Web.WebPages from solution references

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