i want to display the gridview in modalpopupextender in asp.net

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C#

My source code as follows;

<asp:UpdatePanel id="updatepanel" runat="server">
         <contenttemplate>
         <asp:Panel ID= "pnlcofirmationsms" Visible = "true" ScrollBars = "Both" runat= "server">
         <asp:GridView ID="gvshowcourse" runat="server"
                      CellPadding="4" ForeColor="#333333" Height="120px" Width="32%">
                        <footerstyle backcolor="#990000" font-bold="True" forecolor="White" />
                        <rowstyle backcolor="#FFFBD6" forecolor="#333333" />
                        <pagerstyle backcolor="#FFCC66" forecolor="#333333" horizontalalign="Center" />
                        <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
                        <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                        <alternatingrowstyle backcolor="White" />
                    
         
         </contenttemplate>
        
       <Aasp:ModalPopupExtender Drag="true" PopupDragHandleControlID="tdHeader" DropShadow="true"
            PopupControlID="pnlcofirmationsms" BackgroundCssClass="modalBackground" TargetControlID="dummy"
            ID="ModalPopupExtender2"  runat="server" CancelControlID="btnCancelRoom">

wheni run shows error as follows

The control with ID 'updatepanel' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.

what is the problem in my source page.

Regards,
Narasiman P.