title: Exception raise While Compiling my ASP.NET MVC3 Application
body: <p>Why this Exception is raise when i compile my ASP.NET MVC3 Application...</p>
  
  <blockquote>
    <p>The type 'System.Web.Mvc.ModelClientValidationRule' exists in both 'c:\Program Files\Microsoft ASP.NET\ASP.NET Web Pages\v2.0\Assemblies\System.Web.WebPages.dll' and 'c:\Program Files\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies\System.Web.Mvc.dll'    </p>
  </blockquote>