c# - when I use the DropDownList1_SelectedIndexChanged to be the trigger of UpDatePanel，it dosn't work -


and tip “dropdownlist1” didn't find “dropdownlist1_selectedindexchanged” 

</asp:scriptmanager>  <asp:updatepanel id="updatepanel1" runat="server">     <contenttemplate>      <asp:dropdownlist id="dropdownlist1" runat="server"           onselectedindexchanged="dropdownlist1_selectedindexchanged">          <asp:listitem>1</asp:listitem>      </asp:dropdownlist>     </contenttemplate>          <triggers>              <asp:asyncpostbacktrigger controlid="dropdownlist1" eventname="dropdownlist1_selectedindexchanged" />           </triggers>

please tell me how make work!

you need autopostback=true

<asp:dropdownlist id="dropdownlist1" runat="server"  autopostback="true"            onselectedindexchanged="dropdownlist1_selectedindexchanged">

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