asp.net - Add class to list item with VB -

i have list in asp.net this:

<ul id="menu" runat="server">   <li class="themenu"><a href="#">menu 1</a></li>   <li class="themenu"><a href="#">menu 2</a></li>   <li class="themenu"><a href="#">menu 3</a></li>   <li class="themenu"><a href="#">menu 4</a></li> </ul> 

i want add class list item when clicked using vb.net. user can see menu item "active one" done using jquery:

$(".themenu").click(function() {   $(this).addclass("active"); }); 

how do using vb.net???

just use jquery. really. doing vb.net means have cause postback, , means re-creating page on server. don't want more have to. adds load server, , adds latency page responses.

i suspect want know later on item marked active, suggest combining <asp:hiddenfield> control, , add line jquery set value of hidden input created control. later on, when need know in vb.net list item marked active, can check hidden field.