[DllImport("winmm.dll", EntryPoint = "mciSendString")]
        public static extern int mciSendStringA(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback);

        private void openDrive(string driveRoot)
        {
            string driveLetter = driveRoot[0].ToString();
            string returnString = string.Empty;

            //Set a name for the specified disk drive
            mciSendStringA("open " + driveLetter + ": type CDaudio alias drive" + driveLetter, returnString, 0, 0);
            //open the disk tray
            mciSendStringA("set drive" + driveLetter + " door open", returnString, 0, 0);
        }
        private void closeDrive(string driveRoot)
        {
            string driveLetter = driveRoot[0].ToString();
            string returnString = string.Empty;

            //Set a name for the specified disk drive
            mciSendStringA("open " + driveLetter + ": type CDaudio alias drive" + driveLetter, returnString, 0, 0);
            //close the disk tray
            mciSendStringA("set drive" + driveLetter + " door closed", returnString, 0, 0);
        }
        private void btnOpen_Click(object sender, EventArgs e)
        {
            if (cDrives.Text != string.Empty)
                openDrive(cDrives.Text);
        }
        private void btnClose_Click(object sender, EventArgs e)
        {
            if (cDrives.Text != string.Empty)
                closeDrive(cDrives.Text);
        }