Re-entry of timer callback method

using System;
using ;
using ;
namespace 
{
  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)
    {
      ("Callback method reentry test:");
      TimersTimerReenter();
      // Here we make sure that the callback method that has already started has a chance to end      (2 * 1000);
      ("Callback method reentry test:");
      ThreadingTimerReenter();
      ();
    }
    /// <summary>
    /// Re-enter the displayed callback method    /// </summary>
    static void TimersTimerReenter()
    {
       timer = new ();
       = 100;    //100ms       += TimersTimerHandler;
      ();
      (2 * 1000); //Run for 2 seconds      ();
    }
    /// <summary>
    /// Re-enter the displayed callback method    /// </summary>
    static void ThreadingTimerReenter()
    {
      //100ms      using ( timer = new 
       (new (ThreadingTimerHandler), null, 0, 100))
      {
        (2 * 1000); //Run for 2 seconds      }
    }
    /// <summary>
    /// callback method    /// </summary>
    /// <param name="sender"></param>
    /// <param name="args"></param>
    private static void TimersTimerHandler(object sender,EventArgs args)
    {
      lock (locko)
      {
        ("Test integer:" + ());
        //Sleep for 10 seconds to ensure that the method is re-entered        (300);
        TestInt1++;
        ("Test integers after increasing by 1:" + ());
      }
    }
    /// <summary>
    /// callback method    /// </summary>
    /// <param name="state"></param>
    private static void ThreadingTimerHandler(object state)
    {
      lock (locko)
      {
        ("Test integer:" + ());
        //Sleep for 10 seconds to ensure that the method is re-entered        (300);
        TestInt2++;
        ("Test integers after increasing by 1:" + ());
      }
    }
  }
}