Installed visual studio 11 beta as wanted to test EF 5 beta but keep hitting this an error.
Method not found: \'Void System.Data.Objects.ObjectContext
I solved this problem removing the policy:
C:\Windows\Microsoft.NET\assembly\GAC_MSIL\policy.4.0.system.data.entity\v4.0_0.0.0.0__b77a5c561934e089\policy.4.0.system.data.entity.config
Which had this information: ... bindingRedirect oldVersion="4.0.0.0" newVersion="4.2.0.0" ...
Hope it helps Rui