Reentrant of ASP. NET timer callback method

Without saying much, please look at the code:

using System;
using System.Collections.Generic;
using System.Text;
namespace NET.MST.Sixth.Reenter
{
  class Reenter
  {
    // Static members used to cause thread synchronization problems 
    private static int TestInt1=0;
    private static int TestInt2 = 0;
    private static object locko = new object();
    static void Main(string[] args)
    {
      Console.WriteLine("System.Timers.Timer  Callback method reentrant test: ");
      TimersTimerReenter();
      // Make sure that the callback method that has already started has a chance to end 
      System.Threading.Thread.Sleep(2 * 1000);
      Console.WriteLine("System.Threading.Timer  Callback method reentrant test: ");
      ThreadingTimerReenter();
      Console.Read();
    }
    /// <summary>
    ///  Display System.Timers.Timer Callback method reentrant of 
    /// </summary>
    static void TimersTimerReenter()
    {
      System.Timers.Timer timer = new System.Timers.Timer();
      timer.Interval = 100;    //100 Milliseconds 
      timer.Elapsed += TimersTimerHandler;
      timer.Start();
      System.Threading.Thread.Sleep(2 * 1000); // Run 2 Seconds 
      timer.Stop();
    }
    /// <summary>
    ///  Display System.Threading.Timer Callback method reentrant of 
    /// </summary>
    static void ThreadingTimerReenter()
    {
      //100 Milliseconds 
      using (System.Threading.Timer timer = new System.Threading.Timer
       (new System.Threading.TimerCallback(ThreadingTimerHandler), null, 0, 100))
      {
        System.Threading.Thread.Sleep(2 * 1000); // Run 2 Seconds 
      }
    }
    /// <summary>
    /// System.Timers.Timer Callback method of 
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="args"></param>
    private static void TimersTimerHandler(object sender,EventArgs args)
    {
      lock (locko)
      {
        Console.WriteLine(" Test integer: " + TestInt1.ToString());
        // Sleep 10 Seconds to ensure method reentry 
        System.Threading.Thread.Sleep(300);
        TestInt1++;
        Console.WriteLine(" Self-increasing 1 Post-test integer: " + TestInt1.ToString());
      }
    }
    /// <summary>
    /// System.Threading.Timer Callback method of 
    /// </summary>
    /// <param name="state"></param>
    private static void ThreadingTimerHandler(object state)
    {
      lock (locko)
      {
        Console.WriteLine(" Test integer: " + TestInt2.ToString());
        // Sleep 10 Seconds to ensure method reentry 
        System.Threading.Thread.Sleep(300);
        TestInt2++;
        Console.WriteLine(" Self-increasing 1 Post-test integer: " + TestInt2.ToString());
      }
    }
  }
}