C#中计算时间段内工作日期

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  static void Main(string[] args)        {            DateTime dt1 = Convert.ToDateTime("2009-01-01");            DateTime dt2 = Convert.ToDateTime("2009-10-08");            int i = 0;            for(DateTime d=dt1;d<=dt2;d=d.AddDays(1))            {                if (!IsWeekEnd(d) && !IsSpecDay(d))                {                    i++;                }            }            Console.WriteLine("work days:{0}",i);           }        static bool IsWeekEnd(DateTime d)        {            return d.DayOfWeek == DayOfWeek.Saturday                 || d.DayOfWeek == DayOfWeek.Sunday;        }        static bool IsSpecDay(DateTime d)        {            return (d >= new DateTime(d.Year, 5, 1) && d <= new DateTime(d.Year, 5, 7))                || (d >= new DateTime(d.Year, 10, 1) && d <= new DateTime(d.Year, 10, 7))                || d == new DateTime(d.Year, 1, 1);        }