C#怎样打开关闭CDROM?

using System;
 using System.Text;
 using System.Runtime.InteropServices;
  
 class CloseCD
 {
  
   [DllImport( "winmm.dll", EntryPoint="mciSendStringA", CharSet=CharSet.Ansi )]
   protected static extern int mciSendString( string lpstrCommand, StringBuilder lpstrReturnString, int uReturnLength, IntPtr hwndCallback );
  
   public static void Main()
   {
  
     int ret = mciSendString( "set cdaudio door open", null, 0, IntPtr.Zero );
  
     Console.ReadLine();
  
     ret = mciSendString( "set cdaudio door closed", null, 0, IntPtr.Zero );
   }}