Get Weekly Business dates for a given two dates range

I want to generate weekly business dates between two dates excluding weekends and holidays. So I want a results

week 1

StartDate {2/18/2019 12:00:00 AM}

EndDate{2/25/2019 12:00:00 AM---wrong end date} ---> 2/27/2019 correct end date

week 2

StartDate {2/25/2019 12:00:00 AM}

EndDate{3/4/2019 12:00:00 AM--wrong end date}----->3/6/2019 -- correct end date

Below is my code. Any help will be appreciated

class Program
{
public class WeekStartEnd
{
public DateTime firstDate;
public DateTime SecondDate;
}
static void Main(string[] args)
{
//usage:
DateTime StartDate = DateTime.Parse("02/12/2019");
DateTime SeriesEndDate = DateTime.Parse("12/31/2025");
DateTime firstMonday = Enumerable.Range(1, (SeriesEndDate - StartDate).Days +1)
.SkipWhile(x => StartDate.AddDays(x).DayOfWeek != DayOfWeek.Monday)
.Select(x => StartDate.AddDays(x))
.First();
TimeSpan ts = (TimeSpan)(SeriesEndDate - firstMonday);
List dates = new List();
for (int i = 0; i < ts.Days; i += 7)
{
dates.Add(new WeekStartEnd() { firstDate = firstMonday.AddDays(i), SecondDate = firstMonday.AddDays(i + 7) });
}
Console.WriteLine(dates);
}
}
}