c# - SelectedIndexChanged event not firing in child control -

i have asp.net control references user control(popup) when button pressed. when button pressed find drop down list in popup user control , set selected value of it.

  protected void btnmybutton_click(object sender, eventargs args)     {         pnlusercontrol_modalpopupextender.show();          if (ddparent.selectedindex > 0)         {             dropdownlist dd = ucmycontrol.findcontrolrecursive("ddchild") dropdownlist;              dd.selectedvalue = ddparent.selectedvalue;          }     } 

in popup user control i'm expecting selectedindexchanged event fire. however, isn't. ideas why case?

markup child control(only relevant code) below:

<asp:formview id="myform" runat="server" datasourceid="dsmyds" defaultmode="insert"> <edititemtemplate>     <asp:panel runat="server">         <table>              <tr>                 <td>                     <asp:label text="name" runat="server" /></td>                 <td>                     <asp:dropdownlist id="ddchild" runat="server" datasourceid="ddds" datamember="" datavaluefield="id" datatextfield="name" selectedvalue='<%# bind("id") %>' autopostback="true" onselectedindexchanged="ddchild_selectedindexchanged" ondatabound="ddchild_databound" />                 </td>             </tr>          </table>         <table>             <tr>                 <td>                     <br />                     <asp:button id="btinsertok" runat="server" text="add" commandname="insert" />                     <asp:button id="btinsertcancel" runat="server" text="cancel" />                 </td>             </tr>         </table>     </asp:panel> </edititemtemplate> 

thanks in advance.

it seems event doesn't fire when changing selected value in code-behind. fires when user changes value selecting new value in drop-down.

what do, move code out of event separate method, , call method event. event still fire when user makes change via ui.

protected void ddchild_selectedindexchanged(object sender, eventargs e) {     importantstuff(); }  public void importantstuff() {     // in selectedindexchanged event } 

then in button click event, store old selectedindex value, make change, , compare new selectedindex value. if they're different, selected index has changed, , can call same method being called selectedindexchanged event above:

protected void btnmybutton_click(object sender, eventargs args) {     pnlusercontrol_modalpopupextender.show();      if (ddparent.selectedindex > 0)     {         dropdownlist dd = ucmycontrol.findcontrolrecursive("ddchild") dropdownlist;          var oldindex = dd.selectedindex;          dd.selectedvalue = ddparent.selectedvalue;          var newindex = dd.selectedindex;          if (oldindex != newindex)  // selected index changed             importantstuff();     } } 

as sam noted, importantstuff() method should public in usercontrol, can access page usercontrol in.

better yet, assuming "important stuff" doesn't need access other controls in usercontrol, move code separate class, , call both places without requiring page call public methods in usercontrol (your code stays little bit cleaner, , less tangled up).