"ORA-01031: insufficient privileges" at connection.Open();

Question

I'm trying to connect to ORACLE 10g database on Windows 7 64x version from C# Desktop application using Oracle.ManagedDataAccess.Client as SYSDBA.

here is my connection string from config file:

<add name="default" connectionString="User Id=scott;Password=tiger;DBA Privilege=SYSDBA;Data Source=(DESCRIPTION =(ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = sherif-PC)(PORT = 1521)))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME =orcl2)));" providerName="Oracle.ManagedDataAccess.Client"/>

and here is the code:

 ConnectionStringSettings ConnectString = ConfigurationManager.ConnectionStrings["default"];
            _dbFact = DbProviderFactories.GetFactory(ConnectString.ProviderName);
            _con = _dbFact.CreateConnection();
            _con.ConnectionString = ConnectString.ConnectionString;
            using (_con)
            {
                _con.Open();
                using (_cmd = _con.CreateCommand())
                {
                    _cmd.CommandText = "select * from EMP;";
                    using (IDataReader reader = _cmd.ExecuteReader())
                    {
                        res = reader.GetString(1);
                    }
                }
                _con.Close();

                MessageBox.Show(res);
            }

I must use DbProviderFactory as it must be general solution for different kind of dbs