C# deal the key down

   protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            const int WM_KEYDOWN = 0x100;

            const int WM_SYSKEYDOWN = 0x104;

            if ((msg.Msg == WM_KEYDOWN) || (msg.Msg == WM_SYSKEYDOWN))
            {
                    switch (keyData)
                    {
                        case Keys.Down:
                            if (cameraController != null)
                            {
                                cameraController.turnDown();
                            }
                            break;
                        case Keys.Up:
                            if (cameraController != null)
                                cameraController.turnUp();
                            break;
                        case Keys.Left:
                            if (cameraController != null)
                                cameraController.turnLeft();
                            break;
                        case Keys.Right:
                            if (cameraController != null)
                                cameraController.turnRight();
                            break;
                        case Keys.Enter:
                            if (isClicked)
                                 connectButton_Click(connectButton,EventArgs.Empty);
                            break;
                    }
            }
            return base.ProcessCmdKey(ref msg, keyData);
        }