class Program
    {
       //dichiaro un contatore
       public static int TimeElapsed=0;

        static void Main(string[] args)
        {
            //istanzio un timer, lo imposto a 1 millisecondo e lo 
            //faccio partire immediatamente
            TimerCallback tc = new TimerCallback(Elapsed);
            Timer t = new Timer(tc, null, 0, 1);
            Thread.Sleep(1000);
            //scrivo il risultato del contatore
            Console.WriteLine(TimeElapsed.ToString());
            Console.ReadLine();
        }

        //funzione choamata ad ogni tick del timer
        public static void Elapsed(object sender)
        {
            TimeElapsed++;
        }

    }

    class Program
    {
       public static int TimeElapsed=0;
       public static bool Done = false;
        static void Main(string[] args)
        {
            TimerCallback tc = new TimerCallback(Elapsed);
            Timer t = new Timer(tc, null, 0, 1);
            System.Timers.Timer St = new System.Timers.Timer();
            St.Interval = 1000;
            St.Elapsed+=new System.Timers.ElapsedEventHandler(St_Elapsed);
            St.Start();
            while (!Done)
            {
                Thread.Sleep(10);
            }
            Console.WriteLine(TimeElapsed.ToString());
            Console.ReadLine();
        }

        public static void St_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            Done = true;
        }

        public static void Elapsed(object sender)
        {
            TimeElapsed++;
        }

    }