计算两个日期之间工作日天数(c#实现)

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public void getDays()
    {
        DateTime dt1 = new DateTime(2010, 01, 01);//初始化一个日期
        DateTime dt2 = DateTime.Now;//获取今天日期
        TimeSpan ts1 = dt1.Subtract(dt2);//TimeSpan得到dt1和dt2的时间间隔
        int countday = ts1.Days;//获取两个日期间的总天数
        int weekday = 0;//工作日
        //循环用来扣除总天数中的双休日
        for (int i = 0; i < countday; i++)
        {
           DateTime tempdt = dt1.Date.AddDays(i);
           if (tempdt.DayOfWeek != System.DayOfWeek.Saturday && tempdt.DayOfWeek != System.DayOfWeek.Sunday)
           {
                    weekday++;
           }
         }
        Response.Write("总天数：" + countday.ToString());
        Response.Write("工作日：" + weekday.ToString());