C# System.Threading.Timer Raw

using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.Threading.Tasks;
	using System.Threading;
	namespace TimerLesson
	{
	public class Program
	{
	static void Main(string[] args)
	{
	Program prg = new Program();
	Thread.Sleep(5000);
	}
	Queue<TimerTask> timerTaskQueue = new Queue<TimerTask>();
	Timer timer;
	public Program()
	{
	timer = new Timer(new TimerCallback(Timer_Tick));
	timerTaskQueue.Enqueue(new TimerTask { WaitTime_msec = 1000, Message = "first task" });
	timerTaskQueue.Enqueue(new TimerTask { WaitTime_msec = 500, Message = "sencond task" });
	timerTaskQueue.Enqueue(new TimerTask { WaitTime_msec = 0, Message = "third task" });
	timer.Change(0, 100);
	}
	private void Timer_Tick(object state)
	{
	lock (this)
	{
	if (timerTaskQueue.Count == 0)
	{
	timer.Change(Timeout.Infinite, Timeout.Infinite);
	return;
	}
	TimerTask task = timerTaskQueue.Dequeue();
	Thread.Sleep(task.WaitTime_msec);
	Console.WriteLine(task.Message);
	}
	}
	}
	public class TimerTask
	{
	private int waitTime_msec;
	public int WaitTime_msec
	{
	get { return waitTime_msec; }
	set { waitTime_msec = value; }
	}
	private string message;
	public string Message
	{
	get { return message; }
	set { message = value; }
	}
	}
	} C# System.Threading.Timer.zip