using System;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var timer = new Timer(o => Console.WriteLine("{0}: Ring!!!", DateTime.Now), null, TimeSpan.Zero, new TimeSpan(0, 0, 30));
            while (true)
                Thread.Yield();
        }
    }
}