Playing sound while Device is in standby mode

Hi all,
I have doing it last nigh and i want to share it with you!
I think, you should use Invoke method to got some functions in API or MFC to play sound.
You can use some prototype like this to get some functions. I mean playsound function to play a song with .wav

using System;
using System.Runtime.InteropServices;

namespace ClassSound
{
 ///

 /// Summary description for InvokeSound.
 ///

 public class InvokeSound
 {
  public InvokeSound()
  {
  }
  [DllImport("coredll", EntryPoint="PlaySound", CharSet=CharSet.Unicode, CallingConvention=CallingConvention.Winapi,SetLastError=false)]
  public static extern bool ExplicitSyntax_PlaySound( string szSound, IntPtr hMod, int flags );
  
  //This method uses the default values for all the arguments of the DllImport attribute instead
  //of explicitly providing values for them like the ExplicitSyntax_PlaySound procedure above.
  [DllImport("coredll")]
  public static extern bool PlaySound (string szSound, IntPtr hMod, int flags);

  [DllImport("coredll")]
  public static extern IntPtr MCIWndCreate(IntPtr hwndParent, IntPtr hInstance, int dwStyle, string szFile);

  [DllImport("coredll")]
  public static extern long MCIWndClose(IntPtr hwnd);

  [DllImport("coredll")]
  public static extern void MCIWndDestroy(IntPtr hwnd);

  [DllImport("coredll")]
  public static extern long MCIWndEnd(IntPtr hwnd);

  [DllImport("coredll")]
  public static extern long MCIWndHome(IntPtr hwnd);

  [DllImport("coredll")]
  public static extern long MCIWndPause(IntPtr hwnd);

  [DllImport("coredll")]
  public static extern long MCIWndPlay(IntPtr hwnd);

  [DllImport("coredll")]
  public static extern long MCIWndResume(IntPtr hwnd);

  [DllImport("coredll")]
  public static extern long MCIWndStop(IntPtr hwnd);

  [DllImport("coredll")]
  public static extern long MCIWndSetVolume(IntPtr hwnd, int iVol);

  [DllImport("coredll")]
  public static extern void MCIWndSetRepeat(IntPtr hwnd, bool f);

  [DllImport("coredll")]
  public static extern IntPtr GetSafeHwnd();

  [DllImport("coredll")]
  public static extern IntPtr AfxGetInstanceHandle();
 }
}

after that you can use these function as well as API in win32

good luck