.net中ajax的timer问题

Question

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> 
　　 <ContentTemplate> 
      <asp:Timer ID="Timer1" runat="server" Interval="10000" OnTick="Timer1_Tick" Enabled="false">      </asp:Timer> 
　　　 <asp:Label runat="server" id="Panel1Time"  Text="chushi "> </asp:Label> 
　　　 <asp:Button runat="server" ID="Panel1Button" Text="Panel 1" OnClick="panel1_click" /> 
　　 </ContentTemplate> 
        <Triggers> 
        <asp:AsyncPostBackTrigger ControlID="Panel1Button" EventName="OnClick" />
        </Triggers>
</asp:UpdatePanel>