c# - How to add a number of days to a Date while skipping weekends and other holidays

Question

Given a Date. How can I add a number of days to it while skipping weekends and other holidays coming between the range?

List <DateTime> holidays = new List<DateTime>()
{
     new DateTime(2012, 01, 03),
     new DateTime(2012, 01, 26)
}; 

dateTimeReview.Value = CalculateFutureDate(dateTimeStart.Value, 7,holidays);

static DateTime CalculateFutureDate(DateTime fromDate, int numberofWorkDays, ICollection<DateTime> holidays)
{
     var futureDate = fromDate;

     for (var i = 0; i < numberofWorkDays; i++ )
     {
          if (futureDate.DayOfWeek == DayOfWeek.Saturday 
             || futureDate.DayOfWeek == DayOfWeek.Sunday
             || (holidays != null && holidays.Contains(futureDate)))
          {
              futureDate = futureDate.AddDays(1); // Increase FutureDate by one because of condition
              futureDate = futureDate.AddDays(1); // Add a working day
          }
     }
     return futureDate;
}

Answer 1

To skip holidays you will first need to create your own list of holidays. Holidays are different in every country and also subject to other factors.

Then you should add days one by one in a loop with a check if the added day is not a weekend day and does not occur in the list of holidays, until the given number of days has been added.

Unfortunately, there is no easier way to do this.