合并两个表

 dtDataSource = dtDtl.Clone();
            for (int i = 2; i < dtDtl2.Columns.Count; i++)
            {
                dtDataSource.Columns.Add(dtDtl2.Columns[i].ColumnName);
            }
            object[] obj = new object[dtDataSource.Columns.Count];

            for (int i = 0; i < dtDtl.Rows.Count; i++)
            {
                dtDtl.Rows[i].ItemArray.CopyTo(obj, 0);
                dtDataSource.Rows.Add(obj);
            }


            if (dtDtl.Rows.Count >= dtDtl2.Rows.Count)
            {
                for (int i = 0; i < dtDtl2.Rows.Count; i++)
                {
                    for (int j = 2; j < dtDtl2.Columns.Count; j++)
                    {
                        dtDataSource.Rows[i][j + dtDtl.Columns.Count-2] = dtDtl2.Rows[i][j].ToString();
                    }
                }
            }
            else
            {
                DataRow drDataSource;
                for (int i = 0; i < dtDtl2.Rows.Count - dtDtl.Rows.Count; i++)
                {
                    drDataSource = dtDataSource.NewRow();
                    dtDataSource.Rows.Add(drDataSource);
                }
                for (int i = 0; i < dtDtl2.Rows.Count; i++)
                {
                    for (int j = 2; j < dtDtl2.Columns.Count; j++)
                    {
                        dtDataSource.Rows[i][j + dtDtl.Columns.Count-2] = dtDtl2.Rows[i][j].ToString();
                    }
                }
            }