如何合并这些单元格？ html表ASP.net中继器

Question

这是我从SQL数据库中检索的数据，是的，它是动态的，我在里面使用了Repeater和html表。我正在尝试合并细胞。对于Panel列，我希望不重复红框中的那些数据

这是我的转发器：

<asp:Repeater ID="rptNotification" runat="server" OnItemDataBound="rptNotification_ItemDataBound">
     <HeaderTemplate>
       <table class="table">
            <tr>
           <th>COURSE</th>
           <th>DATE</th>
           <th>DAY</th>
            <th>TIME</th>
            <th>TITLE</th>
             <th>NAME</th>
           <th>PANEL</th>
          </tr>
         </HeaderTemplate>
         <ItemTemplate>
           <tr>
            <td rowspan="1">
             <asp:Label ID="lblCOURSE" runat="server" Text='<%#Eval("[COURSE]") %>'></asp:Label>
                </td>
              <td rowspan="1">
                 <asp:Label ID="lblDate" runat="server" Text='<%#Eval("[DATE]") %>'></asp:Label>
               </td>
              <td rowspan="1">
                 <asp:Label ID="lblDAY" runat="server" Text='<%#Eval("[DAY]") %>'></asp:Label>
                 </td>
                <td rowspan="1">
                  <asp:Label ID="lblTIME" runat="server" Text='<%#Eval("[TIME]") %>'></asp:Label>
                 </td>
                 <td rowspan="1"> 
                  <asp:Label ID="lblTITLE" runat="server" Text='<%#Eval("[TITLE]") %>'></asp:Label>
                  </td>
                  <td rowspan="1"> 
                    <asp:Label ID="lblNAME" runat="server" Text='<%#Eval("[NAME]") %>'></asp:Label>
                   </td>
                     <td rowspan="1" colspan="1"> 
            <asp:Label ID="lblPANEL" runat="server" Text='<%#Eval("[PANEL]") %>'></asp:Label>
                </td>
               </tr>
                    </ItemTemplate>
              <FooterTemplate>
         </table>
            </FooterTemplate>
            </asp:Repeater>

这是我背后的代码：

private void Test()
        {
            SqlCommand cmd = new SqlCommand("myQuery");
            DataSet ds = myClass.getSet(cmd);
            DataRowCollection data = ds.Tables[0].Rows;
            for (int i = data.Count - 1; i > 0; i--)
            {
                if (data[i]["COURSE"].ToString() == data[i - 1]["COURSE"].ToString())
                {
                    data[i]["COURSE"] = "";
                }
                if (data[i]["DAY"].ToString() == data[i - 1]["DAY"].ToString())
                {
                    data[i]["DAY"] = "";
                }
                if (data[i]["TIME"].ToString() == data[i - 1]["TIME"].ToString())
                {
                    data[i]["TIME"] = "";
                }
                if (data[i]["DATE"].ToString() == data[i - 1]["DATE"].ToString())
                {
                    data[i]["DATE"] = "";
                }
                if (data[i]["TITLE"].ToString() == data[i - 1]["TITLE"].ToString())
                {
                    data[i]["TITLE"] = "";
                }
                if (data[i]["NAME"].ToString() == data[i - 1]["NAME"].ToString())
                {
                    data[i]["NAME"] = "";
                }
            }
            rptNotification.DataSource = data;
            rptNotification.DataBind();
        }