<form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
            <asp:Timer ID="Timer1" runat="server" Interval="1000" ontick="Timer1_Tick">
            </asp:Timer>
        </ContentTemplate>
    </asp:UpdatePanel>
    </form>