Obtendo valores da tabela Oracle DB na caixa de listagem em c# /wpf

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        using (OracleConnection conn = new OracleConnection(ConnectionString))
        {
            OracleCommand cmdd = new OracleCommand("select * from employees", conn);

            conn.Open();
            cmdd.ExecuteNonQuery();

            OracleDataReader dr = cmdd.ExecuteReader();

            OracleDataAdapter da = new OracleDataAdapter(cmdd);
            DataTable dt = new DataTable();
            da.Fill(dt);

            listboxReport.ItemsSource = dt.AsDataView();
            listboxReport.DisplayMemberPath = dt.Columns[1].ToString();
        }
    }