using System;

    public class Timer
    {
        public static void MainTimer()
        {
            // Normally, the timer is declared at the class level, so
            // that it doesn't go out of scope when the method ends.
            // In this example, the timer is needed only while Main 
            // is executing. However, KeepAlive must be used at the
            // end of Main, to prevent the JIT compiler from allowing 
            // aggressive garbage collection to occur before Main 
            // ends.
            System.Timers.Timer aTimer = new System.Timers.Timer();

            // Hook up the Elapsed event for the timer.
            aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);

            // Set the Interval to 2 seconds (2000 milliseconds).
            aTimer.Interval = 2000;
            aTimer.Enabled = true;
            Console.ReadLine();

            // Keep the timer alive until the end of Main.
            GC.KeepAlive(aTimer);
        }

        // Specify what you want to happen when the Elapsed event is 
        // raised.
        private static void OnTimedEvent(object source, ElapsedEventArgs e)
        {
            Console.WriteLine("¡Hola Mundo!");
        }
    }