C++ datagridview動態合併儲存格代碼

效果如下圖第一列“國家”，相同的資料可以合并為一個儲存格顯示。
我的datagridview資料來源是通過圖形化介面拖放dataset與資料庫教程綁定的

/// <summary>
/// 合并GridView中某列相同資訊的行(儲存格)
/// </summary>
/// <param name="GridView1">GridView</param>
/// <param name="cellNum">第幾列</param>
public static void GroupRows(GridView GridView1, int cellNum)
{
    int i = 0, rowSpanNum = 1;
    while (i < GridView1.Rows.Count - 1)
    {
        GridViewRow gvr = GridView1.Rows[i];

        for (++i; i < GridView1.Rows.Count; i++)
        {
            GridViewRow gvrNext = GridView1.Rows[i];
            if (gvr.Cells[cellNum].Text == gvrNext.Cells[cellNum].Text)
            {
                gvrNext.Cells[cellNum].Visible = false;
                rowSpanNum++;
            }
            else
            {
                gvr.Cells[cellNum].RowSpan = rowSpanNum;
                rowSpanNum = 1;
                break;
            }

            if (i == GridView1.Rows.Count - 1)
            {
                gvr.Cells[cellNum].RowSpan = rowSpanNum;
            }
        }
    }
}