Synchronizing a Timers.Timer elapsed method when stopping

Question

With reference to this quote from MSDN about the System.Timers.Timer:

The Timer.Elapsed event is raised on a ThreadPool thread, so the event-handl

Answer 1

Here is a very simple way to prevent this race condition from occurring:

private object _lock = new object();
private Timer _timer; // init somewhere else

public void StopTheTimer()
{
    lock (_lock) 
    {
        _timer.Stop();
    }
}

void elapsed(...)
{
    lock (_lock)
    {
        if (_timer.Enabled) // prevent event after Stop() is called
        {
            // do whatever you do in the timer event
        }
    }
}