How to Ignor Sunday and Saturdays on a DateTime Picker?

Question

hi,
I need to count the sick leaves in a month, for that i have to ignor Sat-sun on a datetime picker. how to i set the DateTime picker to ignor Sat and Sun?
 
Assume there are two date time pickers dt1 and dt2 thus there difference will return teh number of days without counting sat-sun
TY in Advance