Counting regular working days in a given period of time

Question

need some help. I need to count regular working days for a given date period, for example, in our country, we have 5 regular working days monday to friday, then in code i ne

Answer 1

One-liner!

int workingDays = Enumerable.Range(0, Convert.ToInt32(endDate.Subtract(startDate).TotalDays)).Select(i=>new [] { DayOfWeek.Saturday, DayOfWeek.Sunday }.Contains(startDate.AddDays(i).DayOfWeek) ? 0 : 1).Sum();

Or more efficient:

DayOfWeek currDay = startDate.DayOfWeek;
int nonWorkingDays = 0;

foreach(var i in Enumerable.Range(0, Convert.ToInt32(endDate.Subtract(startDate).TotalDays)))
{
     if(currDay == DayOfWeek.Sunday || currDay == DayOfWeek.Saturday) 
          nonWorkingDays++;
     if((int)++currDay > 6) currDay = (DayOfWeek)0;
}