C#中让窗体自动靠边隐藏

private void Yincangtimer_Tick(object sender, EventArgs e)//窗体隐藏事件
        {
            int a = Control.MousePosition.Y;//光标的在屏幕中的 Y 坐标
            int b = Control.MousePosition.X;//光标的在屏幕中的 X 坐标
            int height = Screen.PrimaryScreen.WorkingArea.Height;//屏幕的高
            int width = Screen.PrimaryScreen.WorkingArea.Width;//屏幕的宽
            int x = this.Left;//窗体的在屏幕中的X坐标
            int y = this.Top;//窗体的在屏幕中的Y坐标
            //判断光标是否在窗体内
            if (b >= x && b <= (this.Width + x) && a >= y && a <= (this.Top + this.Height))
            {
                return;
            }
            else
            {//隐藏窗体
                if ((x + this.Width) >= width)
                {
                    this.Top = this.Top;
                    this.Left = width - 5;
                }
                else if (x <= 0)
                {
                    this.Top = this.Top;
                    this.Left = 5 - this.Width;
                }
                else if (y <= 0)
                {
                    this.Left = this.Left;
                    this.Top = 5 - this.Height;

                }
                else
                {

                    return;
                }
            }
        }

//光标离开窗体
        private void MainForm_MouseLeave(object sender, EventArgs e)
        {
            Yincangtimer.Start();
        }
        //光标进入窗体
        private void MainForm_MouseEnter(object sender, EventArgs e)
        {
            int height = Screen.PrimaryScreen.WorkingArea.Height;//屏幕的高
            int width = Screen.PrimaryScreen.WorkingArea.Width;//屏幕的宽
       
            if (this.Left < 0)
            {
                this.Left = 0;
                this.Top = this.Top;
                Yincangtimer.Stop();
            }
            else if (this.Left > width - this.Width)
            {
                this.Left = width - this.Width;
                this.Top = this.Top;
                Yincangtimer.Stop();
            }
            else if (this.Top <= 0)
            {
                this.Left = this.Left;
                this.Top = 0;
                Yincangtimer.Stop();
            }

            else
            { return; }
        }