[C#]時間延遲Time and Thread

using System;
using System.Threading; //thread要用
using System.Timers; // Timer要用
					
  public class Program{
        
        private static System.Timers.Timer aTimer; //宣告一個static Timer 
        
        public static void Main(String[] arg){
            
            Console.WriteLine("延遲前時間" + DateTime.Now.ToString("yyyy/MM/dd hh:ss"));
            
            aTimer = new System.Timers.Timer(500); //每0.5秒後執行一次

            aTimer.Elapsed += new ElapsedEventHandler(RUN);//執行RUN這個事件

            aTimer.Enabled = true; // 開始執行
		
            Thread.Sleep(2000); //執行續休息兩秒
            
            Console.WriteLine("Thread延遲" + DateTime.Now.ToString("yyyy/MM/dd hh:ss"));
			
          }

      public static void RUN(Object source, ElapsedEventArgs e){
       aTimer.Enabled = false; //要改成false 不然會一直執行
       Console.WriteLine("Timer延遲" + DateTime.Now.ToString("yyyy/MM/dd hh:ss"));
        }
    }