c# - Drop Down List resets -

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my drop down list resets default when try select item, , doesn't trigger's code behind method when put line break , try debug it:

here's markup,

<script type="text/javascript">     function bringpopup()      {              $.blockui({message: $('#anotherup'), css: { width: '600px' } });     } </script>    <div id="anotherup" style="display: none; cursor: default">     <asp:updatepanel id="updatepanel2" runat="server" updatemode="conditional" childrenastriggers="false">         <contenttemplate>                 <asp:dropdownlist id="drop1" runat="server" enableviewstate="true" autopostback="true" onselectedindexchanged="drop1_selectedindexchanged"/>         </contenttemplate>      <triggers>         <asp:asyncpostbacktrigger controlid="drop1" eventname="selectedindexchanged" />     </triggers>     </asp:updatepanel> </div> <asp:updatepanel id="updatepanel1" runat="server" updatemode="conditional" childrenastriggers="true">     <contenttemplate>         <input type="button" id="button3" value="click me bring pop up" onclick="bringpopup()" />         <br />     </contenttemplate> </asp:updatepanel>

here's code behind,

 public partial class myusercontrol : usercontrol  {         protected void page_load(object sender, eventargs e)         {             if (!ispostback)             {                 binddropdownlist();             }         }          protected void binddropdownlist()         {             using (sqldatasource ds = new sqldatasource(connectionstring(), selectcommand()))             {                 system.data.dataview dv = (system.data.dataview)ds.select(datasourceselectarguments.empty);                 if (dv.count > 0)                 {                     drop1.datasource = ds;                     drop1.datatextfield = "username";                     drop1.databind();                     drop1.items.insert(0, "please select username ");                 }             }             updatepanel2.update();         }          protected void drop1_selectedindexchanged(object sender, eventargs e)         {             //while debugging never hits break point.         } }

update

if comment out updatepanel2 ddl doesn't reset still doesn't trigger's code behind method.

this common problem sharepoint event handling. please try below code in page load.

    protected void page_load(object sender, eventargs e)     {         drop1.selectedindexchanged += new eventhandler(drop1_selectedindexchanged);          if (!ispostback)         {             binddropdownlist();         }     }

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