合并相同格式table

public DataTable CombineTheSameDatatable(DataTable dt1, DataTable dt2)
      {

          if (dt1.Rows.Count == 0 && dt2.Rows.Count == 0)
          {

              return new DataTable();

          }

          if (dt1.Rows.Count == 0)
          {

              return dt2;

          }

          if (dt2.Rows.Count == 0)
          {

              return dt1;

          }

          for (int i = 0; i < dt2.Rows.Count; i++)
          {
              for (int j = 0; j < dt2.Columns.Count;j++ )

                  dt1.Rows.Add(new object[] { dt2.Rows[i][j] });
             
          }
          return dt1;

      }