如何将此GridView设置为只有一个具有相同值的单元格？

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        for (int i = 1; i < e.Row.Cells.Count; i++)
        {
            TableCell currentCell = e.Row.Cells[i];
            TableCell previousCell = e.Row.Cells[i - 1];

            if (currentCell.Text == previousCell.Text)
            {
                currentCell.Visible = false;
                previousCell.ColumnSpan += 1;
            }
        }
    }
}