//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;private void Form1_MouseDown(object sender, MouseEventArgs e){    if (this.WindowState == FormWindowState.Normal)    {        ReleaseCapture();        SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);    }}