РЕДАКТИРАНЕ :Добре, сега публикувам отново отговора си с помощта на Oracle:
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();
}
}
Резултат: