RunOneShot.cs

/// <summary>
/// Run an action after the specified delay
/// </summary>
/// <param name="delayMillis">millisecond delay before running an action</param>
/// <param name="doOnce">action to run</param>
public static void RunOneShot(int delayMillis, Action doOnce)
{
   if (delayMillis <= 0) throw new ArgumentException("RunOneShot delayMillis argument must be greater than 0");
   if (doOnce == null) throw new ArgumentException("RunOneShot doOnce argument cannot be null");

   // create a one-shot timer
   var t = new System.Timers.Timer(delayMillis) { AutoReset = false, Enabled = true };

   // define the handler to be called at the elapsed time
   t.Elapsed += (caller, e) =>
   {
      // dispose the timer because it is only used once
      var timer = caller as System.Timers.Timer;
      if (timer != null)
      {
         timer.Dispose();
      }

      // run the provided action
      doOnce();
   };

   // make it happen
   t.Start();
}