LINQ extension methods not available for EnumerableRowCollection

Question

I have a following line of code:

var availableClients = (Controller.ListClientsForCurrentUser() as DataTable).AsEnumerable();

and I want to

Answer 1

Are you missing

using System.Linq;

by any chance? Once you've got an EnumerableRowCollection<TRow> it should be fine. (The main problem using a DataTable if if you forget to call AsEnumerable, but that isn't a problem here.)

Answer 2

Check that there are

using System.Data;
using System.Linq;

and that you are referencing System.Core and System.Data