从一个datatable复制到另一个

从Dataset dt中的DataTable1 dt1复制到DataTable2 dt2，方法如下：

foreach (DataRow row in dt.dt1.Rows)
                    {
                        DataRow DataTable2Row = Dataset.dt2.NewRow();
                        dt2Row ["REC_ID"] = CommomFun.GetRandomNum();//新增一列REC_ID并加入数据
                        foreach (DataColumn dc in dt.dt1.Columns)
                        {
                              dt2[dc.ColumnName] = row[dc];
                        }
                        dt.dt2.Rows.Add(DataTable2Row );
                    }