程序代码：

    public partial class Form1 : Form
    {
        Timer timer1= new Timer();
        public Form1()
        {
            InitializeComponent();
            this.timer1.Enabled = true;
            this.timer1.Interval = 200;
            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            label1.Text=DateTime.Now.ToString()；//label1自己从右边拉一个
        }
    }