playing mp3 through c#

As an alternative to the solution by Prasad (actually, by the author of the referenced article):

You can use Windows Media Player control. Basically, you will need to add COM reference to your project. See:
http://msdn.microsoft.com/en-us/library/bb383953%28v=vs.90%29.aspx[^],
http://msdn.microsoft.com/en-us/library/windows/desktop/dd562851%28v=vs.85%29.aspx[^],
http://diptimayapatra.wordpress.com/2010/04/05/using-windows-media-player-com-in-wpf/[^].

Alternatively, you can find some wrappers or ports of third-party players, such as VLC:
http://en.wikipedia.org/wiki/VLC_media_player[^],
http://www.videolan.org/vlc[^].

See this CodeProject article: nVLC[^].

—SA