repeater合并单元格

前台：

 <td runat="server" id="tdName"><%#Eval("td_name")%></td>

后台：

　　　　 rptList.DataSource = pds;
        rptList.DataBind();
　　　　　//合并方法放到数据邦定之后
        for (int i = rptList.Items.Count - 1; i > 0; i--)
        {
            HtmlTableCell oCell_Previous = rptList.Items[i - 1].FindControl("tdName") as HtmlTableCell;
            HtmlTableCell oCell = rptList.Items[i].FindControl("tdName") as HtmlTableCell;

            oCell.RowSpan = (oCell.RowSpan == -1) ? 1 : oCell.RowSpan;
            oCell_Previous.RowSpan = (oCell_Previous.RowSpan == -1) ? 1 : oCell_Previous.RowSpan;

            if (oCell.InnerText == oCell_Previous.InnerText)
            {
                oCell.Visible = false;
                oCell_Previous.RowSpan += oCell.RowSpan;
            }
        }