using System;
using System.Threading;
using System.Globalization;
class MainClass
{
public static void Main(string[] args)
{
TimeSpan waitTime = new TimeSpan(1000);
new Timer(delegate(object s) {
Console.WriteLine("{0} : {1}",
DateTime.Now.ToString("HH:mm:ss.ffff"), s);
}
, null, waitTime, new TimeSpan(-1));
}
}