c#连接远程oracle数据库

 private static string connstr = "Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=Mhost) 
(PORT=mport)))(CONNECT_DATA=(SERVICE_NAME=mywervicename)));Persist Security Info=True;User Id=myusername; 
Password=mypassword";
 private OracleConnection DBCONN = new OracleConnection(connstr);

private static string connstr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
private OracleConnection DBCONN = new OracleConnection(connstr);

  public void GetData()
        {
            if (DBCONN.State == ConnectionState.Closed)
            {
                DBCONN.Open();
                string quarystr = "select * from tablename";
                OracleCommand comm = new OracleCommand(quarystr, DBCONN);
                OracleDataReader reader;
                reader = comm.ExecuteReader();
                while (reader.Read())
                {
                    string str = "" + reader.GetString(1);
                }
            }
        }