System.Timers.Timer Elapsed event executing after timer.Stop() is called

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This is well known behavior. System.Timers.Timer internally uses ThreadPool for execution. Runtime will queue the Timer in threadpool. It would have already queued before you have called Stop method. It will fire at the elapsed time.

To avoid this happening set Timer.AutoReset to false and start the timer back in the elapsed handler if you need one. Setting AutoReset false makes timer to fire only once, so in order to get timer fired on interval manually start timer again.

yourTimer.AutoReset = false;

private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
     try
     {
         // add your logic here
     }
     finally
     {
         yourTimer.Enabled = true;// or yourTimer.Start();
     }
}

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