using System;
using System.Threading;

namespace ConsoleApplication29
{
  class Program
  {
    static void Main(string[] args)
    {
      try
      {
        DateTime _timeEnd = DateTime.Now.AddSeconds(62);
        ThreadPool.QueueUserWorkItem((arg) =>
        {
          TimeSpan _ts = _timeEnd - DateTime.Now;
          while (true)
          {
            Thread.Sleep(1000);
            if (_ts.TotalSeconds >= 0)
            {
              Console.WriteLine("還剩余{0}分鐘{1}秒", _ts.Minutes, _ts.Seconds);
              _ts = _ts.AddSeconds(-1);
            }
          }
        });
      }
      catch (Exception ex)
      {
        Console.WriteLine(ex.Message);
      }
      finally
      {
        Console.ReadLine();
      }
    }
  }
  public static class TimeSpanToolV2
  {
    public static TimeSpan AddSeconds(this TimeSpan ts, int seconds)
    {
      return ts.Add(new TimeSpan(0, 0, seconds));
    }
    public static TimeSpan AddMinutes(this TimeSpan ts, int minutes)
    {
      return ts.Add(new TimeSpan(0, minutes, 0));
    }
    public static TimeSpan AddHours(this TimeSpan ts, int hours)
    {
      return ts.Add(new TimeSpan(hours, 0, 0));
    }
  }
}