Adding Days to a Date but Excluding Weekends

var dateTime = DateTime.Now.AddBusinessDays(4);

int daysToAdd = weekDaysToAdd + ((weekDaysToAdd / 5) * 2) + (((origDate.DOW + (weekDaysToAdd % 5)) >= 5) ? 2 : 0);

public DateTime AddBusinessDays(DateTime dt, int nDays)
{
    int weeks = nDays / 5;
    nDays %= 5;
    while(dt.DayOfWeek == DayOfWeek.Saturday || dt.DayOfWeek == DayOfWeek.Sunday)
    	dt = dt.AddDays(1);

    while (nDays-- > 0)
    {
    	dt = dt.AddDays(1);
    	if (dt.DayOfWeek == DayOfWeek.Saturday)
    		dt = dt.AddDays(2);
    }
    return dt.AddDays(weeks*7);
}

W + N % 5.

D + ((N / 5) * 7) + N % 5).