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DATENAME([Year],
      dbo.reservation.begintime) + N'Äê' + CAST(DATEPART([Month],
      dbo.reservation.begintime) AS varchar) + N'ÔÂ' + DATENAME([Day],
      dbo.reservation.begintime) + N'ÈÕ' + DATENAME([Hour], dbo.reservation.begintime)
      + N'µã' + DATENAME([Minute], dbo.reservation.begintime) + N'·Ö' AS btime
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 select * from dbo.reservation where getdate() not between begintime and endtime;
´íÎó 108 “System.Nullable<System.TimeSpan>”²»°üº¬“Hours”µÄ¶¨Ò壬²¢ÇÒÕÒ²»µ½¿É½ÓÊÜÀàÐÍΪ“System.Nullable<System.TimeSpan>”µÄµÚÒ»¸ö²ÎÊýµÄÀ©Õ¹·½·¨“Hours”(ÊÇ·ñȱÉÙ using Ö¸Áî»ò³ÌÐò¼¯ÒýÓÃ?)
½â¾ö£º      TimeSpan parseTime =(System.TimeSpan)(endtime - begintime);
                RadioButtonList1.Items.FindByValue(parseTime.Hours.ToString()).Selected = true;
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