c＃ 计算２个时间的时间差

private TimeSpan GetTimePeriod(DateTime dt1, DateTime dt2)
{
return dt2.Subtract(dt1);
}

DateTime DateTime1, DateTime2;
DateTime1 = Convert.ToDateTime("2014-01-23 23:00:00");
DateTime2 = Convert.ToDateTime("2014-01-24 00:00:00");
TimeSpan ts = GetTimePeriod(DateTime1, DateTime2);
string dateDiff = ts.Days.ToString() + "天" + ts.Hours.ToString() + "小时" + ts.Minutes.ToString() + "分钟" + ts.Seconds.ToString() + "秒";