C#屏幕右下角弹窗

        Timer timer_Up = new Timer();        Timer timer_Down = new Timer();        private void Form1_Load(object sender, EventArgs e)        {            this.Left = Screen.PrimaryScreen.WorkingArea.Width - this.Width - 1;            this.Top = Screen.PrimaryScreen.WorkingArea.Bottom;            timer_Up.Interval = 10;            timer_Up.Tick += timer_Up_Tick;            timer_Up.Enabled = true;        }        private void Form1_FormClosing(object sender, FormClosingEventArgs e)        {            timer_Down.Interval = 10;            timer_Down.Tick += timer_Down_Tick;            timer_Down.Enabled = true;            e.Cancel = true;        }        private void timer_Up_Tick(object sender, EventArgs e)        {            if (this.Bottom <= Screen.PrimaryScreen.WorkingArea.Bottom)            {                this.Top = Screen.PrimaryScreen.WorkingArea.Bottom - this.Height - 1;                timer_Up.Enabled = false;                return;            }            this.Top -= 10;        }        private void timer_Down_Tick(object sender, EventArgs e)        {            if (this.Top >= Screen.PrimaryScreen.Bounds.Bottom)            {                timer_Down.Enabled = false;                Environment.Exit(0);                return;            }            this.Top += 10;        }