DateTime dt1="2012-10-10 0:00:00";
DateTime dt2="2012-10-18 0:00:00";
               while (dt1 != dt2)
                {
                    if (dt1.Month == drDay[i].Month && dtBl.Day == drDay[i].Day)
                    {
                        days++;
                    }
                    dt1.AddDays(1);//这是让dt1加一天吗？？
                }