speech recognition using c#

Question

hello guys
i'm facing a problem!
i'm using microsoft Agent with c# in a speech recognition application for recognizing just spoken numbers
the application can hear my voice from microphone and recognize what is the spoken number
the problem is that i want to recognize the number that is recorded in .wav sound file rather than speaking it
can i do that or microsoft Agent just recognize voice entered from a microphone??
please anyone can help me with that ?