private static bool KiemTraVeThangQui(int LoaiVe, int Nam, int ThangQui, ref string NgayHetHanVe) { DateTime dateTime = DateTime.MinValue; DateTime dateTime2 = DateTime.MinValue; CSDL.TinhThoiHanVe(LoaiVe, ThangQui, Nam, ref dateTime, ref dateTime2); DateTime t = DateTime.Parse(Strings.Format(DateAndTime.Now, "MM/dd/yyyy")); dateTime = DateTime.Parse(Strings.Format(dateTime, "MM/dd/yyyy")); dateTime2 = DateTime.Parse(Strings.Format(dateTime2, "MM/dd/yyyy")); if (DateTime.Compare(t, dateTime) >= 0 & DateTime.Compare(t, dateTime2) <= 0) { NgayHetHanVe = Strings.Format(dateTime2, "dd/MM/yyyy"); return(true); } return(false); }