[MonoTouch] How to play .3gp audio file using MonoTouch?

[bharath]

How to play .3gp audio file using MonoTouch? I have used like this,

var mediaFile = NSUrl.FromFilename("song.3gp");
var audioPlayer = AVAudioPlayer.FromUrl(mediaFile);
audioPlayer.FinishedPlaying += delegate { audioPlayer.Dispose(); };
audioPlayer.Play();

But I got NullReferenceException on this line, 

audioPlayer.FinishedPlaying += delegate { audioPlayer.Dispose(); };

How to play this song?

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Bharath
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