public string GetEletricalRoom(int factoryId) { try { string connString = ConnectionStringFactory.GetByFactoryId(factoryId); ISqlServerDataFactory factory = new SqlServerDataFactory(connString); ComplexQuery query = new ComplexQuery(); query.AddNeedField("ElectricalRoom", "ID"); query.AddNeedField("ElectricalRoom", "Name"); DataTable dt = factory.Query(query); return(ComboboxJsonParser.DataTableToJson(dt, "ID", "Name")); } catch { return("[]"); } }