全屏显示窗体

        private void Form1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            bool Validate=(this.WindowState==FormWindowState.Maximized);
            if(Validate){
                this.FormBorderStyle = FormBorderStyle.Sizable;
                this.WindowState = FormWindowState.Normal;
            }else{
                this.FormBorderStyle = FormBorderStyle.None;
                this.WindowState = FormWindowState.Maximized;
            }
        }