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 type is defined in that assembly (just as it was in .NET 3.5).