c#计算两个时间差

       private string DateDiff(DateTime DateTime1, DateTime DateTime2)
        {
            string dateDiff = null;
            try
            {
                TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
                TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
                TimeSpan ts = ts1.Subtract(ts2).Duration();
                dateDiff = ts.Days.ToString() + "天"+
                        ts.Hours.ToString() + "小时"
                        + ts.Minutes.ToString() + "分钟"
                        + ts.Seconds.ToString() + "秒";
            }
            catch
            {

            }
            return dateDiff;
        }