How do i display a panel by clicking a button inside datalist

Please this is what i want to achieve, i dont need to display any record

 

 protected void ShowPanel(object sender, EventArgs e)
    {
        pnlcomments.Visible = true;
    }

<asp:LinkButton ID="btnview" runat="server" OnClick="ShowPanel">>View Comments</asp:LinkButton>
                                     <asp:Panel ID="pnlcomments" runat="server" Visible="false">

                                         /////
                                     </asp:Panel>

the issue am having is that the code cant see the panel on code behind, is it possible to use javascript just like toggling visble and hidden