c# DataTable 값 변경하기

DataSet DataSet2 = new DataSet();
DataTable DataTable2 = dt;
DataTable2.Rows[rowIndex].BeginEdit();
DataTable2.Rows[rowIndex]["ItemCode"] = dtoDisplayItems.ItemCode;
DataTable2.Rows[rowIndex]["ItemName"] = dtoDisplayItems.ItemName;
DataTable2.Rows[rowIndex]["ItemDescription"] = dtoDisplayItems.ItemDescription;
DataTable2.Rows[rowIndex].EndEdit();
DataTable2.AcceptChanges();
DataSet2.Tables.Add(DataTable2.Copy());
DataSet2.Tables[0].AcceptChanges();
return DataSet2;