ASP.Net AJAX UpdateProgress control usage with example

This way

 <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <asp:UpdateProgress runat="server" AssociatedUpdatePanelID="UpdatePanel1">
                    <ProgressTemplate>
                        <asp:Label ID="lblText" runat="server" Text=""></asp:Label>
                        <asp:Image ID="Image1" runat="server" ImageUrl="~/Images/Updating.gif" />
                        Processing...
                    </ProgressTemplate>
                </asp:UpdateProgress>
                <asp:Button ID="btnInvoke" runat="server" Text="Click" OnClick="btnInvoke_Click" />
            </ContentTemplate>
        </asp:UpdatePanel>