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asp.net c# razor

Could not load file or assembly ‘System.Web.WebPages.Razor, Version=3.0.0.0

I want using external logins so I installed Oauth by package manager:

 PM> Install-Package Microsoft.AspNet.WebPages.OAuth

Then I got this error after installed it then I install razor:

PM> Install-Package Microsoft.AspNet.Razor

But I still have this exception. Further more my application is an asp.net application and not a MVC application. Thanks for help.

[FileNotFoundException: Could not load file or assembly 'System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.]
Microsoft.Web.WebPages.OAuth.PreApplicationStartCode.Start() +0

You have upgraded to Razor 3. Remember that VS 12 (until update 4) doesn’t support it. Install The Razor 3 from nuget or downgrade it through these step

geekswithblogs.net/anirugu/archive/2013/11/04/how-to-downgrade-razor-3-and-fix-the-issue-that.aspx