winform倒計時

public partial class Form1 : Form
    {
        private int Seconds;
        public Form1()
        {
            InitializeComponent();
　　　　　　　// 任務欄是否顯示
            this.ShowInTaskbar = false;
            timer1.Interval = 1000;
            timer1.Enabled = false;
            // 定時間隔：25分鍾
            Seconds = 60 * 60;
            ShowTime();
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
　　　　　　　　// 倒計時開始
            timer1.Start();
        }
        private void ShowTime()
        {
            // 顯示剩余時間
            label1.Text = string.Format("{0:d2}:{1:d2}",
                    Seconds / 60,
                    Seconds % 60);
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            Seconds--;
            if (Seconds < 0)
            {
                // 停止倒計時
                timer1.Stop();
                if (WindowState == FormWindowState.Minimized)
                {
                    //還原窗體顯示   
                    this.Show();
                    WindowState = FormWindowState.Normal;
                    //激活窗體並給予它焦點
                    this.Activate();
                    //任務欄區顯示圖標
                    //this.ShowInTaskbar = true;
                    //托盤區圖標隱藏
                    notifyIcon1.Visible = false;
                }
                return;
            }
            ShowTime();
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            Seconds = 60 * 60;
            ShowTime();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
　　　　　　　　// 托盤圖標的雙擊事件
            this.Show();
            //還原窗體顯示   
            this.WindowState = FormWindowState.Normal;
            this.Activate();
            //任務欄區顯示圖標
            //this.ShowInTaskbar = true;
            //托盤區圖標隱藏
            notifyIcon1.Visible = false;
        }

        private void Form1_Deactivat(object sender, EventArgs e)
        {
　　　　　　　　//借助失去焦點事件判斷窗口最小化
            if (this.WindowState == FormWindowState.Minimized)
            {
                this.notifyIcon1.Visible = true;
                this.Hide();
                this.ShowInTaskbar = false;
            }
        }
    }