Question related to Oracle Provider for OLE DB and Oracle Data Provider for .NET / ODP.NET

When I use Oracle Provider for OLE DB:

      String CommandText = "select SYS_CONTEXT('USERENV','OS_USER') from

dual";

       OleDbConnection myConnection = new OleDbConnection(connectString);

       OleDbCommand myCommand = new OleDbCommand(CommandText,

myConnection);

       myConnection.Open();

       OleDbDataReader myReader = myCommand.ExecuteReader();

       while (myReader.Read())

           Response.Write("ID: " + myReader[0].ToString());

       myReader.Close();

       myConnection.Close();

I get ID: 9999999999E (The actual user)

However,

When I use Oracle Data Provider for .NET / ODP.NET:

      String connectStr =

ConfigurationManager.ConnectionStrings["LiveConnectionString"].ConnectionStr

ing;

       String CommandText = "SELECT SYS_CONTEXT('USERENV', 'OS_USER') FROM

DUAL";

       using (OracleConnection myConn = new OracleConnection(connectStr))

       {

           OracleCommand myCmd = new OracleCommand(CommandText, myConn);

           myConn.Open();

           OracleDataReader myReader = myCmd.ExecuteReader();