public partial class Form : Form    {        //窗体移动API        [DllImport("user32.dll")]        public static extern bool ReleaseCapture();        [DllImport("user32.dll")]        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int IParam);        public const int WM_SYSCOMMAND = 0x0112;        public const int SC_MOVE = 0xF010;        public const int HTCAPTION = 0x0002;        [DllImport("user32")]        private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, IntPtr lParam);        private const int WM_SETREDRAW = 0xB;        public Form()        {            InitializeComponent();        } //窗体的MouseDown事件        private void YJ_Show_MouseDown(object sender, MouseEventArgs e)        {            if (this.WindowState == FormWindowState.Normal)            {                ReleaseCapture();                SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);            }        }}