Where is System.Linq in .NET 4.0?

Question

I migrated an asp.net app to 4.0. Now I am getting an error \"The type or namespace name \'IQueryable\' could not be found\". The reference to System.Linq is invalid and I can\'

Answer 1

Make sure you are referencing System.Core.dll in your project. The IQueryable<T> type is defined in that assembly (just as it was in .NET 3.5).

Answer 2

It's in the System.Core.dll assembly.

Answer 3

Make sure you have a reference to System.Core.dll in your project - I believe System.Linq resides there.