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POHow to implement count down timer in asp.net using vb
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  1. POHow to implement count down timer in asp.net using vb
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    copied!<p><strong>Default.aspx</strong></p> <pre><code>&lt;asp:ScriptManager ID="ScriptManager1" runat="server"&gt; &lt;/asp:ScriptManager&gt; &lt;asp:UpdatePanel ID="UpdatePanel1" runat="server"&gt; &lt;ContentTemplate&gt; &lt;asp:Label ID="Label1" runat="server"&gt;2:00:00&lt;/asp:Label&gt; &lt;asp:Timer ID="Timer1" runat="server" Interval="1000" OnTick="Timer1_Tick"&gt; &lt;/asp:Timer&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p><strong>Default.aspx.vb</strong></p> <pre><code>Dim timer, timer_arr() As String timer = Label1.Text timer_arr = timer.Split(":") Dim seconds = Integer.Parse(timer_arr(2)) Dim minutes = Integer.Parse(timer_arr(1)) Dim hours = Integer.Parse(timer_arr(0)) If seconds = 0 And minutes = 0 And hours = 0 Then Timer1.Enabled = False Else seconds = seconds - 1 End If If (seconds &lt; 0) Then seconds = 59 minutes = minutes - 1 End If If minutes &lt; 0 Then minutes = 59 hours = hours - 1 End If Label1.Text = hours &amp; ":" &amp; minutes &amp; ":" &amp; seconds </code></pre> <p>The above code showing the expected result, i mean, i need the count down timer, which will display the countdown timer to the client like <code>2:45:34</code>. But the problem is the value of seconds is decreasing by twice. i mean after <code>2:45:34</code> in the next second instead of displaying <code>2:45:33</code>, it displaying <code>2:45:32</code> and so on. I'm very confused, from my point of view, everything is all right. Need help !! </p> <p><strong>UPDATED</strong></p> <p>I believe, client side scripting i.e. javascript will be the another option, but i need the timer for online exam system, which means timer should continue ticking whenever client send the request to the server. But, if i will use javascript then timer value will interrupted and will show unexpected value i.e. may be initialized again, and other cause. So, i believe server side scripting will be the best. If anyone have other suggestion, then i will appreciate. !! </p>
 

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