Timer Срабатывание события Tick - C#

private static System.Timers.Timer aTimer;
private static DateTime startTime;
private static int desiredInterval;
private static int ticks;
 
public static void Main()
{
    SetTimer();
 
    Console.WriteLine("\nPress the Enter key to exit the application...\n");
    Console.WriteLine("The application started at {0:HH:mm:ss.fff}", DateTime.Now);
    Console.ReadLine();
    aTimer.Stop();
    aTimer.Dispose();
 
    Console.WriteLine("Terminating the application...");
}
 
private static void SetTimer()
{
    // Create a timer with a two second interval.
    startTime = DateTime.Now;
    desiredInterval = 2000;
    aTimer = new System.Timers.Timer(desiredInterval);
    ticks = 0;
    // Hook up the Elapsed event for the timer. 
    aTimer.Elapsed += OnTimedEvent;
    aTimer.AutoReset = true;
    aTimer.Enabled = true;
}
 
private static void OnTimedEvent(Object source, ElapsedEventArgs e)
{
    Console.WriteLine("The Elapsed event was raised at {0:HH:mm:ss.fff}",
                      e.SignalTime);
    ticks++;
    var desiredTime = startTime.AddMilliseconds((ticks + 1) * desiredInterval);
    var interval = (desiredTime - DateTime.Now).TotalMilliseconds;
    aTimer.Interval = interval;
}