<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <ListBox Name="groupsList" ItemsSource="{Binding Path=Groups}"
                 ItemTemplate="{DynamicResource groupItemTemplate}"/>
    </Grid>

    <Window.Resources>
        <DataTemplate x:Key="groupItemTemplate">
            <StackPanel Orientation="Vertical">
                <TextBlock Text="{Binding Path=Code}" FontWeight="Bold"/>
                <TextBlock Text="{Binding Path=idSpec}"/>
            </StackPanel>
        </DataTemplate>
    </Window.Resources>
</Window>

using System;
using System.Windows;
using System.Data.OleDb;
using System.Data;

namespace WpfApplication1
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        DataSet ds;
        OleDbConnection conn;
        public MainWindow()
        {
            InitializeComponent();
            conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0; " +
                "Data Source=D:\\lp.accdb; Persist Security Info=False;");
            conn.Open();
            OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM Groups;",
                                                            conn);
            ds = new DataSet();
            adapter.Fill(ds, "Groups");
            groupsList.DataContext = ds;
        }
    }
}