Fill Table footer columns

Hi

 I have below code in code behind. I want when user clicks on Group Name row data should get filled in Table footer columns

StudentDetail Res = bALStudents.GetStudentDetail(Convert.ToInt32(colum.StudentID));
lblGroup.Text = colum.Group.GroupName;
htmlTable.Append("<tr>");
htmlTable.Append("<td style='display:none'>" + colum.ID + "</td>");
htmlTable.Append("<td>" + Count.ToString() + "</td>");
htmlTable.Append("<td>" + colum.Group.GroupName + "</td>");
htmlTable.Append("<td>" + Res.Name + "</td>");
htmlTable.Append("<td>" + "" + "</td>");
htmlTable.Append("<td>" + "" + "</td>");

<tfoot runat="server" id="AddCtrls">
    <tr>
        <td style='display: none'></td>
        <td>-</td>
        <td>
            <asp:Label ID="lblGroup" runat="server" Text=""></asp:Label></td>
        <td>
            <asp:DropDownList ID="ddlStudent" class="form-control" required="true" parsley-trigger="change" runat="server">
                <asp:ListItem Value="">Select Student</asp:ListItem>
            </asp:DropDownList></td>
        <td>
            <asp:TextBox ID="txtfrDate" CssClass="form-control daterange-single" onkeydown="return false" placeholder="Group Assigned From Date" runat="server"></asp:TextBox></td>
        <td>
            <asp:TextBox ID="txttoDate" CssClass="form-control daterange-single" onkeydown="return false" placeholder="Group Assigned To Date" runat="server"></asp:TextBox></td>
        <td>
            <asp:LinkButton ID="lnkAddRecord" class="btn bg-success" OnClick="lnkAddRecord_Click" runat="server">Add</asp:LinkButton>
        </td>
    </tr>
</tfoot>

Thanks