'System.Array' does not contain a definition for 'Contains' ...

http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/d20d585c-de6f-4fce-bb62-8a4ff2321657

You have to Add Linq references.

using System.Linq; and (possibly):
using System.Data.Linq; // not sure about the latter though.