//Clock
class Clock : INotifyPropertyChanged
    {
        private Timer timer = new Timer();
        private DateTime currentTime = DateTime.Now;

        public Clock()
        {
            timer.Interval = 1000;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            currentTime = DateTime.Now;
            PropertyChangedEventArgs arg = new PropertyChangedEventArgs("CurrentTime");
            OnPropertyChanged(arg);
        }

        protected void OnPropertyChanged(PropertyChangedEventArgs e)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, e);
        }

        public DateTime CurrentTime
        {
            get { return currentTime; }
        }

        #region INotifyPropertyChanged 成员

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion
    }

//调用

Clock clock = new Clock();
label1.DataBindings.Add("Text", clock, "CurrentTime", true);

大家觉得如何？