To use the PlaySound function, you must import the function from the 
proper DLL.  Place the using line at the top of your class file:   using 
System.Runtime.InteropServices;  // for DllImport

In your variable declarations, add this declaration:

[DllImport("winmm.dll")]
private static extern int PlaySound(String filename, int handle, int mode);

Now place a WAV file in the same directory as your executable, and play 
it like so:

PlaySound("test.wav", 0, 0x0001);  // 0x0001 means to play asynchronously

Asynchronous play tells Windows to play the sound and immediately return 
control to the program.  This enables the animation to continue while 
the sound is being played.  To play a sound synchronously, change the 
last argument to 0x20000.

To stop a sound from playing, do this:   PlaySound(null, 0, 0);