Comparing two datatables and returning a datatable by matching rows in c#.net using linq

  public DataTable get_Comparing(DataTable dt1, DataTable dt2)

   {

      DataTable dtMerged = (from a in dt1.AsEnumerable()

                                  join b in dt2.AsEnumerable()

                            on a["Student_Id"].ToString() equals b["Student_Id"].ToString()

                                  into g

                                  where g.Count() > 0

                                  select a).CopyToDataTable();

            return dtMerged;

   }