ScriptManager ServiceReference DropDownExtender

        <asp:ScriptManager ID="ScriptManager1" runat="server">
        <Services>
            <asp:ServiceReference Path="Service.asmx" />
        </Services>
        </asp:ScriptManager>

1<asp:Panel ID="panelS" runat="server" CssClass="dropshow" Style="display: none; visibility: hidden; border:solid 1px #B5C4CC; width:384px;">
2                                                </asp:Panel>
3                                                <ajaxToolkit:DropDownExtender ID="ddd" runat="server" DropDownControlID="panelS"
4                                                    TargetControlID="tbSearch">
5                                                </ajaxToolkit:DropDownExtender>

 1    function setText() 
 2    }