c# 4.0 - How can i work with the ASP.NET Update Panel? -


in asp.net application have 2 dropdownlist,if select first one's 1 value means automatically want change values of dropdown two,but not working.here asp code. 

<asp:scriptmanager id="scriptmanager1" runat="server">     </asp:scriptmanager>     <asp:updatepanel id="updatepanel1" runat="server">         <contenttemplate>             <asp:label id="label1" runat="server" text="state"></asp:label>&nbsp;&nbsp;&nbsp;             <asp:dropdownlist id="ddlstate" runat="server" height="23px" width="195px" onselectedindexchanged="dropdownlist1_selectedindexchanged"                 autopostback="true">                 <asp:listitem>--select--</asp:listitem>                 <asp:listitem>kerela</asp:listitem>                 <asp:listitem>tamilnadu</asp:listitem>                 <asp:listitem>karnataka</asp:listitem>             </asp:dropdownlist>             <br />             <br />             <br />             <br />             <asp:label id="label2" runat="server" text="district"></asp:label>&nbsp;&nbsp;&nbsp;             <asp:dropdownlist id="ddldistrict" runat="server" height="23px" width="189px" autopostback="true">             </asp:dropdownlist>         </contenttemplate>     </asp:updatepanel>

i copied code is, , gave definition selected index changed event 

protected void dropdownlist1_selectedindexchanged(object sender, eventargs e) {       listitem li = new listitem("text");      ddldistrict.items.add(li); }

and worked beautifully. might have other issue. can copy selected index changed event code?


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