How To Convert Linq Query Result into IEnumerable Individual DataRows

Here I was Written LINQ query to group By Data It works fine for me  togroup Data ,
               var groupbyfilter = from dr in dtPassengers.AsEnumerable()                                    group dr by dr["CUSTOMER_CONTACT"];                DataTable dt = dtPassengers.Clone();                // Step 2: Execute the Query and store the results into temp table                foreach (var x in groupbyfilter)              &n ...