How to calculate the no : of working days in a month?

      int[] daysInMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

      int month = 6; // June

      int year  = 2012;

      if (DateTime.IsLeapYear(year)) daysInMonth[1] = 29;

      DateTime dt = new DateTime(year, month, 1);

      int workingDays = 0;

      

      for(int i = 1; i <= daysInMonth[month - 1]; i++)

      {

         if(dt.DayOfWeek != DayOfWeek.Sunday && dt.DayOfWeek != DayOfWeek.Saturday) workingDays++;

         dt = dt.AddDays(1);

      }

      label1.Text = workingDays.ToString(); // 21

If you want to regard Saturday as a working day, then just change this line:

    if(dt.DayOfWeek != DayOfWeek.Sunday && dt.DayOfWeek != DayOfWeek.Saturday) workingDays++;

to this:

    if(dt.DayOfWeek != DayOfWeek.Sunday) workingDays++;