GridView合并相同列单元格

 1. 此方法主要是数据绑定控件的合并单元格的功能
绑定的时候调用方法 
参数（数据绑定的id,要合并的列数）

 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.Trim() == gvrNext.Cells[cellNum].Text.Trim())
                {
                    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;
                }
            }
        }
    }