using System.Runtime.InteropServices; const int HT_CAPTION = 0x2; const int WM_NCLBUTTONDOWN = 0xA1; [DllImport("user32.dll")] private static extern bool ReleaseCapture(); [DllImport("user32.dll")] private static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam); private void Form_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left..