namespace ConsoleApplication1
{
    public class Program
    {
        public static void Main()
        {
            MyTimer timer = new MyTimer();
            timer.Interval = 1000;
            timer.Elapsed += delegate(object sender, System.Timers.ElapsedEventArgs e)
            {
                Console.WriteLine(System.DateTime.Now);
            };
            timer.Start();

            Console.ReadKey();
        }
    }

    public sealed class MyTimer : System.Timers.Timer
    {
    }
}

------解决方案--------------------
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C# code
namespace ConsoleApplication1
{
    public class Program
    {
        public static void Main()
        {
            MyTimer timer = new MyTimer();
            timer.Interval = 1000;
     ……