多屏情况下，设置窗口默认第二屏 无窗口显示

//  form1.cs
        public Form1()
        {
            InitializeComponent();
            //多屏显示的时候，设置窗口在那个屏幕显示
            Screen[] sc;
            sc = Screen.AllScreens;
            this.StartPosition = FormStartPosition.Manual;
            this.Location = new Point(sc[1].Bounds.Left, sc[1].Bounds.Top);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            timer2.Start();
            this.FormBorderStyle = FormBorderStyle.None;
            this.WindowState = FormWindowState.Maximized;
        }