I want to generate a list of weekly business dates

Question

I want to generate a list of weekly business dates between two dates excluding weekends and holidays. I have managed to exclude the Weekends and created a routine for the holidays. Now I need to exclude the holidays. Below is my code.

using System;
using System.Collections.Generic;
using System.Linq;
namespace SeriesTest
{
class Program
{
public class BusinessWeekDays
{
public DateTime Monday;
public DateTime Sunday;
}
private static List Holidays = new List()
{
new DateTime(1, 1, 1), //New Year Day
new DateTime(1, 5, 1), //Labour Day
new DateTime(1, 7, 4), //Independence Day
new DateTime(1, 3, 1), //Martin Luther King Jr. Day
new DateTime(1, 3, 2), //Presidents Day
new DateTime(1, 12, 25), //Christmas
new DateTime(1, 5, 5), //Memorial Day
new DateTime(1, 9, 1), //Labor Day
new DateTime(1, 10, 2), //Columbus Day
new DateTime(1, 11, 4), //Columbus Day
};
private static bool IsHoliday(DateTime value, List holidays = null)
{
if (null == holidays)
holidays = Holidays;
return (value.DayOfWeek == DayOfWeek.Sunday) ||
(value.DayOfWeek == DayOfWeek.Saturday) ||
holidays.Any(holiday => holiday.Day == value.Day &&
holiday.Month == value.Month);
}
public static int BusinessDays(DateTime fromDate, DateTime toDate, List holidays = null)
{
int result = 0;
for (var date = fromDate;
date < toDate.Date;
date = date.AddDays(1))
if (!IsHoliday(date, holidays))
result += 1;
return result;
}
static void Main(string[] args)
{
var StartDate = DateTime.Parse("02/12/2019");
var SeriesEndDate = DateTime.Parse("12/31/2025");
var holidays = new List();
var firstMonday = Enumerable.Range(0, 7)
.SkipWhile(x => StartDate.AddDays(x).DayOfWeek != DayOfWeek.Monday)
.Select(x => StartDate.AddDays(x))
.First();
var ts = (SeriesEndDate - firstMonday);
var dates = new List();
for (var i = 0; i < ts.Days; i += 7)
{
//Remove holidays. Weekend already removed here
if (BusinessDays(StartDate, SeriesEndDate, holidays) != 0)
{
dates.Add(new BusinessWeekDays { Monday = firstMonday.AddDays(i), Sunday = firstMonday.AddDays(i + 9) });
}
}
Console.WriteLine(dates);
}
}
}