winform倒计时

public partial class Form1 : Form
    {
        private int Seconds;
        public Form1()
        {
            InitializeComponent();
　　　　　　　// 任务栏是否显示
            this.ShowInTaskbar = false;
            timer1.Interval = 1000;
            timer1.Enabled = false;
            // 定时间隔：25分钟
            Seconds = 60 * 60;
            ShowTime();
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
　　　　　　　　// 倒计时开始
            timer1.Start();
        }
        private void ShowTime()
        {
            // 显示剩余时间
            label1.Text = string.Format("{0:d2}:{1:d2}",
                    Seconds / 60,
                    Seconds % 60);
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            Seconds--;
            if (Seconds < 0)
            {
                // 停止倒计时
                timer1.Stop();
                if (WindowState == FormWindowState.Minimized)
                {
                    //还原窗体显示   
                    this.Show();
                    WindowState = FormWindowState.Normal;
                    //激活窗体并给予它焦点
                    this.Activate();
                    //任务栏区显示图标
                    //this.ShowInTaskbar = true;
                    //托盘区图标隐藏
                    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)
        {
　　　　　　　　// 托盘图标的双击事件
            this.Show();
            //还原窗体显示   
            this.WindowState = FormWindowState.Normal;
            this.Activate();
            //任务栏区显示图标
            //this.ShowInTaskbar = true;
            //托盘区图标隐藏
            notifyIcon1.Visible = false;
        }

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