timer value should not change during postback

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i have two page(question and result).,In first page(question) i'm displaying question and options for the question... and iam displaying the next question via button click function(it fetches the next qusetion from the database) ... now i want to add timer for the whole set of questions..once timer value decreses to '0' it should redirect to result page..my problem is whenever i clicks the next button to show next question the timer values is starting from original value.. i want the timer to continue from last value not from initial value..help me

Posted 19-Mar-13 21:35pm

Ramkumar K

Updated 19-Mar-13 21:40pm

v4

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Ramkumar K 20-Mar-13 4:24am

pls help me

Ankur^\m/ 20-Mar-13 4:56am

Which version of .Net framework are you using? ASP.NET do not have inbuilt timer control until ver 4.0
Or are you using AJAX extension Timer Control?

2 solutions

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Chinmaya C · Answer 1 · 2013-03-19T23:52:00

Solution 2

As ASP.NET is stateless, it doesn't maintain the state of timer as well. :(

So you need to implement State Management technique.

The following is the example of state management using ViewState:

C#

protected void Page_Load(object sender, EventArgs e)
{
     if(ViewState["counter"] != null)
         timer1.Interval = (int)ViewState["counter"];
     else
      {
         timer1.Interval = 30000; // Assuming the total time of the exam is 30 secs
          ViewState["countet"]=30000;
       }
}

Please feel free to ask any doubt if you have. :)

Posted 19-Mar-13 23:52pm

Chinmaya C

Updated 20-Mar-13 2:28am

v2

Comments

Ramkumar K 20-Mar-13 7:47am

How can i store the value of timer into "ViewState["counter"]" before postback..

Chinmaya C 20-Mar-13 14:07pm

Try with the following code:

write the following page design:
<head runat="server">
<title></title>
<script type="text/javascript" language="javascript">
var remain;
function countDown() {
displayTimer(remain);
remain = remain - 1;
if (remain == 0) {
window.location = "result.aspx";
}
else {
document.getElementById("hdnTimeRemained").value = remain;
setTimeout("countDown()", 1000);
}
}
function readCounter() {
remain = document.getElementById("hdnTimeRemained").value;
countDown();
}
function displayTimer(secs) {
var hr = Math.floor(secs / 3600);
secs = secs % 3600;
var min = Math.floor(secs / 60);
var sec = secs % 60;

document.getElementById("lblTime").innerHTML = hr + ":" + min + ":" + sec;
}
</script>
</head>
<body önload="readCounter();">
<form id="form1" runat="server">
<div id="lblTime">
</div>
<asp:HiddenField ID="hdnTimeRemained" runat="server" />
<div>
<asp:Button ID="btnNext" runat="server" Text="Next" />
</div>
</form>
</body>
</html>

In the code behind's page_load event write the following:

protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
hdnTimeRemained.Value = "3600";
}

hope this will help... :)

Deependra Khangarot · Answer 2 · 2013-03-19T22:38:00

Solution 1

I think you can you can use AJAX to implement desired functionality.

Please go through this link :

AJAX Timer[^]

Posted 19-Mar-13 22:38pm

Deependra Khangarot