second dropdown get value problem in updatepanel

Hi
I have 2 dropdown in updatepanel the second dropdown is populated by selection of first one
i cannot get the selectedvalue or text of second dropdownlist .it return the first value always
i read an article to check it in pageload event but in  my case i do not know how
here is the code:
 <asp:UpdatePanel ID="UpdatePanel3" runat="server" UpdateMode="Conditional">
                        <ContentTemplate>
         <asp:DropDownList ID="ddlState" runat="server" Width="205px"
                                                ...