c# - listbox not updating with update control and timer -


i have problem. putted updatecontrol timer , script manager. timer works listbox not refreshing or updateing on page: here code

 <asp:updatepanel id="updatepanel1" updatemode="conditional" runat="server">                         <contenttemplate>                             <asp:timer id="timer1" runat="server" interval="1000" ontick="timer1_tick">                             </asp:timer>                             <asp:listbox id="listbox1" runat="server" enableviewstate="true" autopostback="true" backcolor="#c440d4" datasourceid="dataoperators" datatextfield="userid" datavaluefield="userid" font-size="medium" forecolor="white" height="336px" onselectedindexchanged="listbox1_selectedindexchanged" width="260px"></asp:listbox>                             <asp:sqldatasource id="dataoperators" runat="server" connectionstring="<%$ connectionstrings:vprotectconnectionstring %>" selectcommand="select distinct guests.userid messages,guests guests.userid = messages.userid , guests.online='online' , (messages.ido=@ido)"></asp:sqldatasource>                          </contenttemplate>                     </asp:updatepanel>

here event:

  <script runat="server" type="text/c#">         protected void timer1_tick(object sender, eventargs e)         {             listbox1.datasource = null;             listbox1.items.clear();           } </script>

timer clears every item in listbox on page items still there... can help?


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