I have MVC assemblies here:
C:\Program Files\Microsoft ASP.NET\ASP.NET MVC 4\Assemblies
and
ASP.NET Web Pages assemblies here:
C:\Program Files\Microsoft ASP.NET\ASP.NET Web Pages\v2.0\Assemblies\
These assemblies are not installed into the GAC (I've checked with gacutil -l), but VS shows all of them in "Add Reference" dialog.
When I run site on IIS these assemblies are also loaded, but path to them is not specified in Web.config:
<add assembly="System.Web.WebPages, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
How these assemblies are found?
It seems that assemblies are installed into the GAC:
C:\Program Files\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools>gacutil.exe /l System.Web.Mvc
Microsoft (R) .NET Global Assembly Cache Utility. Version 4.0.30319.17929
Copyright (c) Microsoft Corporation. All rights reserved.
The Global Assembly Cache contains the following assemblies:
System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
Number of items = 2
Just use the right gacutil, now there are two of them -- one for 1.1/2.0/3.0/3.5/3.5SP1 and another for 4.0/4.5.