Detecting silence / low level in a WAV file

[C# Programming]

Hi,

This is my first post and i am quite new to c# but am really enjoying the learning process, i have been looking at the many examples on the code project site for a few weeks now and have not found anything that i think covers what i want to do.

I want to read in an hours worth of audio in a wav file and check that there is audio in it. the audio is recorded from a radio receiver into the computer and stored in hour chunks.

i just need to be sure it is storing audio (radio program) not static noise (lower level) or very low level (wrong audio source etc.)

Any input or advice on how to achieve this would be greatly appreciated

thanks

Simon