要检查一天中的时间，请使用：
TimeSpan start = new TimeSpan(10, 0, 0); //10 o'clock
TimeSpan end = new TimeSpan(12, 0, 0); //12 o'clock
TimeSpan Now = DateTime.Now.TimeOfDay;
if ((Now > start) && (Now < end))
{
//match found
}
对于绝对时间，请使用：
DateTime start = new DateTime(2009, 12, 9, 10, 0, 0)); //10 o'clock
DateTime end = new DateTime(2009, 12, 10, 12, 0, 0)); //12 o'clock
DateTime Now = DateTime.Now;
if ((Now > start) && (Now < end))
{
//match found
}
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