DaysBetween

using System;

namespace OP2
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime date1 = DateTime.Parse("25.10.2021 01:23:12");
            DateTime date2 = DateTime.Parse("1.11.2021 12:13:50");

            int daysCounter = 0, holidaysDaysCounter = 0;

            for (DateTime dateTemp = date1; dateTemp.Date < date2.Date; dateTemp = dateTemp.Add(new TimeSpan(1,0,0,0)))
            {
                daysCounter++;
                holidaysDaysCounter +=
                    (dateTemp.DayOfWeek != DayOfWeek.Saturday && dateTemp.DayOfWeek != DayOfWeek.Sunday) ? 1 : 0;
            }

            Console.WriteLine("Первая дата: {0}, вторая дата: {1}", date1, date2);
            Console.WriteLine("Разница между датами:\nДней: {0},\nВыходных дней: {1},\nБудней: {2},\nЧасов: {3}", daysCounter, holidaysDaysCounter, daysCounter - holidaysDaysCounter, (date1.TimeOfDay > date2.TimeOfDay ? date1.TimeOfDay : date2.TimeOfDay - date1.TimeOfDay < date2.TimeOfDay ? date1.TimeOfDay : date2.TimeOfDay));
        }
    }
}