Question

How do I get a timer event to fire one at a time.
For example I have a timer that raises an event every 10 minutes.
The event that is raised takes 10 or more minutes to finish executing.
I would like the timer to reset AFTER the event has finished.
In other words I do not want to raise more than 1 instance of the event at any one time.

Answer 1

Usually what I do is have my event stop the timer when it’s raised and then restart the timer when the event process completes:

private void timerHandler(object sender, TimerElapsedEventArgs e)
{
    Timer timer = (Timer)sender;
    timer.Stop();
    RunProcess();
    timer.Start();
}

public void RunProcess()
{
    /* Do stuff that takes longer than my timer interval */
}

Now my timer will start again on completion of the process