Workdays in Month

I need a function that returns the workdays in any given month/year.
Bonus if it also excludes holidays.

Thanks,
Art

Given Year in A1, Month(number) in B1
C1:C20 = list of holiday dates you create to be excluded from the count.

=NETWORKDAYS(DATE(A1,B1,1),DATE(A1,B1+1,0),C1:C20)