EventThrow

using System;
using System.Threading.Tasks;
using System.Timers;

namespace ConsoleApplication1
{
    class Demo
    {
        static void Main()
        {
            Remind alarmSet = new Remind();
            alarmSet.CheckReminder();
            Console.ReadLine();
        }
    }

    public class Remind
    {
        private static int counterAlarms = 0;
        private double interval = 3000; // milliseconds

        public void CheckReminder()
        {
            Timer checkForTime = new Timer(interval);
            checkForTime.Elapsed += new ElapsedEventHandler(checkForTime_Elapsed);
            checkForTime.Enabled = true;
        }

        private void checkForTime_Elapsed(object sender, ElapsedEventArgs e)
        {
            Console.WriteLine(counterAlarms++);
        }
    }
}