How to stop Timer that run in new thread in ASP.net 2.0

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C#

ASP.NET

Hi everyone,

I want to know if User is online or offline,
and i used timer to update User last visit in database every 5 seconds,

I am using System.Timers.Timer in ASP.net 2.0,

When I use it I notice that the elapse event is run in new thread as it does not cause a Postback event to fire, but the problem is that when I close the browser the elapse event is still being raised and not stopped.

I want to stop the timer when the browser is closed or when I navigate to another website, is there any approach to stop it?

also when i make Sign out and execute statement _timer.Stop() the Timer not stopped.

That is all code:

public partial class MainMasterPage : System.Web.UI.MasterPage
{
    protected System.Timers.Timer _timer;

    protected void Page_Init(object sender, EventArgs e)
    {
        _timer = new System.Timers.Timer(5000);

        _timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.IsAuthenticated)
        {
            _timer.Start();
        }
        else
        {
            _timer.Stop();
        }
    }

    private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    {
        // Code here for update User last visit in database
    }
}