[C#] 倒數計時

private void Form1_Load(object sender, EventArgs e)
{
     timer1.Start();
}

private void timer1_Tick(object sender, EventArgs e)
{
    //要倒數的時間，也可以倒數5秒，例：DateTime MyEndDate = DateTime.Now.AddSeconds(5);
    DateTime MyEndDate = new DateTime(YY,MM,DD,hh,mm, 0);
    //取得電腦現在時間
    DateTime MyStartDate = DateTime.Now;
    //執行倒數
    TimeSpan MySpan = MyEndDate.Subtract(MyStartDate);
    string diffDay = Convert.ToString(MySpan.Days);
    string diffHour = Convert.ToString(MySpan.Hours);
    string diffMin = Convert.ToString(MySpan.Minutes);
    string diffSec = Convert.ToString(MySpan.Seconds);
    //顯示秒數
    label1.Text = diffDay + "天" + diffHour + "時" + diffMin + "分" + diffSec + "秒";
}