C# 两时间，时间间隔

#region 返回时间差
        public static 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();
                string hours = ts.Hours.ToString(), minutes = ts.Minutes.ToString(),seconds = ts.Seconds.ToString();
                if(ts.Hours<10)
                {
                    hours = "0" + ts.Hours.ToString();
                }
                if (ts.Minutes<10)
                {
                    minutes = "0" + ts.Minutes.ToString();
                }
                if(ts.Seconds<10)
                {
                    seconds = "0" + ts.Seconds.ToString();
                }
                dateDiff = hours + ":"+ minutes + ":"+ seconds;
            }
            catch
            {

}
            return dateDiff;
        }
        #endregion