public class OracleDBManager
    {
        private OracleConnection _con;
        private const string connectionString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)) (CONNECT_DATA=(SID=xe))); User Id=C##Swipe;Password=kovrik98;";
        private const string OracleDBUser = "Swipe";
        private const string OracleDBPassword = "kovrik98";

        public OracleDBManager()
        {
            InitializeDBConnection();
        }

        ~OracleDBManager()
        {
            if (_con != null)
            {
                _con.Close();
                _con.Dispose();
                _con = null;
            }
        }

        public OracleConnection getConnection()
        {
            return _con;
        }
        private void InitializeDBConnection()
        {
            _con = new OracleConnection();
            _con.ConnectionString = connectionString;
            _con.Open();
            WriteLine("connected");
        }
    }