I am working on Windows 7 based application development in Silverlight. I have not been able to find a way to play a an audio file in windows 7 phone programmatically. I hav
Use Xna to play the sound. You can cross reference Xna from a Silverlight app though, for playing a sound file, you need to the following:
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio
// ...
Stream stream = TitleContainer.OpenStream("sounds/bonk.wav");
SoundEffect effect = SoundEffect.FromStream(stream);
FrameworkDispatcher.Update();
effect.Play();
All the best for your application development!