public string GetGasStation(string stGasStationID, string stGasStoreID) { if (stGasStoreID == null) { if (stGasStationID == null) { m_dataResponse = m_dalGasStation.GetGasStations(); } else { m_dataResponse = m_dalGasStation.GetGasStation(stGasStationID); } } else { m_dataResponse = m_dalGasStation.GetGasStationsOfStore(stGasStoreID); } return(JSonHelper.ConvertObjectToJSon(m_dataResponse)); }