How to return a list of weekend dates between 2 dates

Use the DateTime.DayOfWeek property.

https://msdn.microsoft.com/en-US/library/system.datetime.dayofweek(v=vs.110).aspx

static public List<string> GetDates(DateTime start_date, DateTime end_date)

    {

        List<string> days_list = new List<string>();

         for (DateTime date = start_date; date <= end_date; date = date.AddDays(1))

        {

            if (date.DayOfWeek == DayOfWeek.Sunday || date.DayOfWeek == DayOfWeek.Saturday)

                 days_list.Add(date.ToShortDateString());

        }

        return days_list;