System.Data.DataSet.CreateDataReader C# (CSharp) Method

        public DataTableReader CreateDataReader()
        {
            if (Tables.Count == 0)
            {
                throw ExceptionBuilder.CannotCreateDataReaderOnEmptyDataSet();
            }

            var dataTables = new DataTable[Tables.Count];
            for (int i = 0; i < Tables.Count; i++)
            {
                dataTables[i] = Tables[i];
            }
            return CreateDataReader(dataTables);
        }

        	public void LoadTest2 ()
        	{
			DataSet ds1 = new DataSet ();
			DataSet ds2 = new DataSet ();
			DataTable dt1 = new DataTable ("T1");
			DataTable dt2 = new DataTable ("T2");
			DataTable dt3 = new DataTable ("T1");
			DataTable dt4 = new DataTable ("T2");
			dt1.Columns.Add ("ID", typeof (int));
			dt1.Columns.Add ("Name", typeof (string));
			dt2.Columns.Add ("EmpNO", typeof (int));
			dt2.Columns.Add ("EmpName", typeof (string));

			dt1.Rows.Add (new object[] {1, "Andrews"});
			dt1.Rows.Add (new object[] {2, "Mathew"});
			dt1.Rows.Add (new object[] {3, "Jaccob"});

			dt2.Rows.Add (new object[] {1, "Arul"});
			dt2.Rows.Add (new object[] {2, "Jothi"});
			dt2.Rows.Add (new object[] {3, "Murugan"});

			ds2.Tables.Add (dt1);
			ds2.Tables.Add (dt2);
			ds1.Tables.Add (dt3);
			ds1.Tables.Add (dt4);

			DataTableReader reader = ds2.CreateDataReader ();
			//ds1.Load (reader, LoadOption.PreserveChanges, dt3, dt4);
			ds1.Load (reader, LoadOption.OverwriteChanges, dt3, dt4);

			Assertion.AssertEquals ("DataSet Tables count mistmatch", ds2.Tables.Count, ds1.Tables.Count);
			int i = 0;
			foreach (DataTable dt in ds1.Tables) {
				DataTable dt5 = ds2.Tables[i];
				Assertion.AssertEquals ("Table " + dt.TableName + " row count mistmatch", dt5.Rows.Count, dt.Rows.Count);
				int j = 0;
				DataRow row1;
				foreach (DataRow row in dt.Rows) {
					row1 = dt5.Rows[j];
					for (int k = 0; k < dt.Columns.Count; k++) {
						Assertion.AssertEquals ("DataRow " + k + " mismatch", row1[k], row[k]);
					}
					j++;
				}
				i++;
			}
		}