protected override void btnDelete_Click(object sender, EventArgs e) { try { base.btnDelete_Click(sender, e); using (ThanhVanTranSysEntities context = new ThanhVanTranSysEntities()) { TicketPriceConfiguration priceConfig = context.TicketPriceConfigurations.SingleOrDefault(i => i.id == _selectedId && i.seat_class == _selectedClass.ToString()); AppLogger.logInfo("btnDelete_Click", "DELETE", priceConfig); if (priceConfig == null) { return; } context.TicketPriceConfigurations.DeleteObject(priceConfig); LoadTicketPriceConfig(); } } catch (Exception exc) { AppLogger.logError("btnDelete_Click", exc); } }