C#構築一時データTableテスト

DataTable dt = new DataTable();
                    DataColumn dc1 = new DataColumn();
                    dc1.ColumnName = "ACCT_TYPE";
                    dc1.DataType = typeof(string);


                    DataColumn dc2 = new DataColumn();
                    dc2.ColumnName = "AREA_GROUP_DESC_EN";
                    dc2.DataType = typeof(string);

                    DataColumn dc3 = new DataColumn();
                    dc3.ColumnName = "MONTHLY_BMOU_M";
                    dc3.DataType = typeof(string);

                    dt.Columns.Add(dc1);
                    dt.Columns.Add(dc2);
                    dt.Columns.Add(dc3);

                    DataRow dr1 = dt.NewRow();
                    dr1[0] = "BB";
                    dr1[1] = "Philippines";
                    dr1[2] = "111";

                    DataRow dr2 = dt.NewRow();
                    dr2[0] = "BB";
                    dr2[1] = "Singapore";
                    dr2[2] = "222";

                    DataRow dr3 = dt.NewRow();
                    dr3[0] = "M1";
                    dr3[1] = "Philippines";
                    dr3[2] = "333";
                    DataRow dr4 = dt.NewRow();
                    dr4[0] = "M1";
                    dr4[1] = "Singapore";
                    dr4[2] = "444";

                    dt.Rows.Add(dr1);
                    //dt.Rows.Add(dr2);
                    dt.Rows.Add(dr3);
                    //dt.Rows.Add(dr4);