{ mciSendStringA("set CDAudio door open", rt, 127, 0); }
{ mciSendStringA("set CDAudio door closed", rt, 127, 0); }

using System.Runtime.InteropServices;
[DllImport("winmm.dll", EntryPoint = "mciSendStringA")]
public static extern void mciSendStringA(string lpstrCommand,
string lpstrReturnString, long uReturnLength, long hwndCallback);
string rt = "";