All date related solution

All date related solution
  protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                GetnextSunday();

                for (int i = 1; i <= 31; i++)
                {
                    DateTime start = new DateTime(2015, 1, i);
                    DateTime stop = new DateTime(2015, 1, 31);

                    int totalWorkingDays = GetNumberOfWorkingDays(start, stop);

                    Console.WriteLine("There are {1} working days from Oct {0}, 2014 to Oct 31, 2014.", i, totalWorkingDays);
                }
                DateTime start1 = new DateTime(2015, 1, 1);
                DateTime stop1 = new DateTime(2015, 1, 31);
                int cntcoun = CountDays(start1, stop1);
                GetAllSundays(start1, stop1);
            }
        }
        public void GetnextSunday()
        {
            var date = DateTime.Now;
            var nextSunday1 = date.AddDays(7 - (int)date.DayOfWeek);

            DateTime d = DateTime.Today;

            int offset = d.DayOfWeek - DayOfWeek.Monday;

            DateTime lastMonday = d.AddDays(-offset);
            DateTime nextSunday = lastMonday.AddDays(6);
        }
        private static int GetNumberOfWorkingDays(DateTime start, DateTime stop)
        {
            TimeSpan interval = stop - start;

            int totalWeek = interval.Days / 7;
            int totalWorkingDays = 5 * totalWeek;

            int remainingDays = interval.Days % 7;


            for (int i = 1; i <= remainingDays; i++)
            {
                DayOfWeek test = (DayOfWeek)(((int)start.DayOfWeek) % 7);
                if (test >= DayOfWeek.Monday && test <= DayOfWeek.Friday)
                    totalWorkingDays++;
            }

            return totalWorkingDays;
        }

        public int CountDays(DateTime fromDate, DateTime toDate)
        {
            int noOfDays = 0;
            DateTime fDate = Convert.ToDateTime(fromDate);
            DateTime tDate = Convert.ToDateTime(toDate);
            while (DateTime.Compare(fDate, tDate) <= 0)
            {
                if (fDate.DayOfWeek != DayOfWeek.Saturday && fDate.DayOfWeek != DayOfWeek.Sunday)
                {
                    noOfDays += 1;
                }
                fDate = fDate.AddDays(1);
            }
            return noOfDays;
        }
        public void GetAllSundays(DateTime Date1, DateTime Date2)
        {
            TimeSpan DateDiff = Date2.Subtract(Date1);
            List<DateTime> lstdate = new List<DateTime>();
            for (int i = 0; i <= DateDiff.Days; i++)
            {
                if (Date1.Date.AddDays(i).DayOfWeek == DayOfWeek.Sunday)
                {
                    lstdate.Add(Date1.Date.AddDays(i));
                }
            }
        }