关于Timer控件

     < form id = " form1 "  runat = " server " >
         < asp:ScriptManager ID = " ScriptManager1 "  runat = " server " >
         </ asp:ScriptManager >

         < asp:UpdatePanel ID = " UpdatePanel1 "  runat = " server " >
             < ContentTemplate >
                 <%=  DateTime.Now  %>
                 < asp:Timer ID = " Timer1 "  runat = " server "  Interval = " 1000 " >
                 </ asp:Timer >
             </ ContentTemplate >
         </ asp:UpdatePanel >
     </ form >

还可以设置Timer的 OnTick方法，设定的时间一到就会调用这个方法