System.Web.WebPages - Not in Add Reference dialog

I'm trying to add a reference to System.Web.WebPages

However, it's not in my "add reference" dialog.

I'm already using MVC 3, and Razor views...开发者_StackOverflow中文版

What am I missing?

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When you click add reference, check under Assemblies->Extensions. I found both v1.0 and v2.0 there.

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Make sure you are targeting the full .NET Framework 4 in your project properties and not the .NET Framework 4 Client Profile. As far as the assembly you are interested in, you will find it in the following folder (remark: this is for a x64 bit OS, for a x86 there is a single Program Files folder):

C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\System.Web.WebPages.dll

So you can simply go ahead and reference it from there.