去除边框

选中窗体，在属性中找到FormBorderStyle，设置为None

实现无边框拖动

　　[DllImport("user32.dll")]
        public static extern bool ReleaseCapture();

        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

        private void Login_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, 0x0112, 0xF012, 0);
        }

给窗体添加MouseDown事件：Login_MouseDown，即可实现功能。

winform学习（9）无边框拖动窗体