FrmAir航空公司飞机订票系统

privatevoidForm1_Load(objectsender,EventArgse){stringsql=string.Format(@"selectId,CityNamefromCityInfo");dataadapter=newSqlDataAdapter(sql,DBhelper.connection);dataadapter.Fill(dataset,"Cmb");//为下拉列表添加“全部”这个选项DataRowrow=