How to create an audio spectrum in C #

I want to make an audio player in C # with a spectrum of signals.

I saw several examples on the net about how to make a player, but I can not find an example about the spectrum.

Can anyone give me directions?

http://www.codeproject.com/KB/directx/directshowmediaplayer.aspx http://www.codeproject.com/KB/directx/directshownet.aspx?fid=4377&select=2579548&fr=1#xx0xx