ajax计时器不需要回发

问题描述

<asp:ScriptManager ID="ScriptManager1"  runat="server">
  </asp:ScriptManager>
            <tr>


                <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="true">
                    <Triggers>
                       <asp:AsyncPostBackTrigger  ControlID="timer2" EventName="tick"  />
                    </Triggers>
                    <ContentTemplate><asp:Label runat="server" Text="Label" ID="label1"></asp:Label></ContentTemplate>
                </asp:UpdatePanel>


                <asp:Timer ID="Timer2" runat="server" interval="60000"  Enabled="true"  OnTick="Timer2_Tick" ViewStateMode="Enabled" ValidateRequestMode="Enabled"></asp:Timer>

i将这个编码用于ajax计时器

当我点击导航栏项目计时器应该开始

，它将在两分钟内结束



但当我点击相同的导航栏项目计时器再次启动但我不需要计时器再次启动

i只需要先启动我点击导航栏项

i have used this coding for ajax timer
when i click in navbar item timer should start
and it wil be end in two minutes

but when i click same navbar item timer start again but i dont need timer to start again
i need to start only first i click navbar item

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