mcs/errors/cs1061-13.cs

   1 // CS1061: Type `string' does not contain a definition for `Where' and no extension method `Where' of type `string' could be found. Are you missing `System.Linq' using directive?
   2 // Line: 8
   3
   4 public class M
   5 {
   6         public static void Main ()
   7         {
   8                 var a = "ababab".Where (l => l == 'b');
   9         }
  10 }