public partial class SimpleCopyCD : Form
    {
       public SimpleCopyCD_Main()
        {
            InitializeComponent();

            CopyThreadObj = new SimpleCopy();
            CopyThreadObj.OpenCDBay += new OpenCDBayHandler(OpenCDBay); 

            MyThread = new Thread(CopyThreadObj.CopyThreadMain);
            MyThread.Start(); 
        }
... bla
... bla
        private void OpenCDBay(object sender, string str)
        {
            openDrive(str);
        }
... bla
... bla
        [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);
        }