how to show selected item of check list box in text box in WPF

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C#

Visual-Studio

WPF

VS2010

i want to show selected item in check list box in text box on a click of button..
can any one help me..my database name is DLL which is in access and table is demo with single field sub.
i am posting my code here..
thank you..
MainWindow.xaml

<Window x:Class="WpfApplication12.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="536" Width="853" Loaded="Window_Loaded">
    <Grid>
        <TabControl Height="260" HorizontalAlignment="Left" Margin="41,57,0,0" Name="tabControl1" VerticalAlignment="Top" Width="731">
            <TabItem Header="old" Name="tabItem1">
                <Grid></Grid>
            </TabItem>
            <TabItem Header="new">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition>
                        </ColumnDefinition>
                        <ColumnDefinition>
                        </ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <Grid Height="180" Margin="10,10,24,37" Width="327">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="10*" />
                            <ColumnDefinition Width="317*" />
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="84*" />
                            <RowDefinition Height="81*" />
                        </Grid.RowDefinitions>
                        <TextBox Grid.ColumnSpan="2" Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="8,60,0,0" Name="textBox3" VerticalAlignment="Top" Width="209" />
                        <ListBox Grid.Column="1" Grid.RowSpan="2" Height="128" HorizontalAlignment="Left" ItemsSource="{Binding Path=tripList}" Margin="13,6,0,0" Name="listLesson" Selector.IsSelected="{Binding IsChecked, ElementName=checkBox, Mode=TwoWay}" VerticalAlignment="Top" Width="194" >
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal">
                                        <CheckBox IsChecked="{Binding IsVisited}" Margin="2" VerticalAlignment="Center" />
                                        <TextBlock FontSize="14" Foreground="Black" Margin="2" Text="{Binding LessonName}" />
                                    </StackPanel>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="236,69,0,0" Name="button3" VerticalAlignment="Top" Width="75" Grid.Column="1" Click="button3_Click" />
                    </Grid>
                </Grid>
            </TabItem>
        </TabControl>
    </Grid>
</Window>

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Data.OleDb;
using System.Data;

namespace WpfApplication12
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public OleDbConnection conn;
        public OleDbDataAdapter da;
        public DataSet ds;
        public DataSet ds1 = new DataSet();
        public DataTable dt;
        public OleDbCommand cmd;
        public OleDbDataReader dr;
        List<LessonInfo> LessonList = new List<LessonInfo>();
        public MainWindow()
        {
            InitializeComponent();
            listLesson.ItemsSource = LessonList;
            DataContext = this;

            conn = new OleDbConnection();

            conn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\Software Development\vishal_wpf\dem\WpfApplication11\WpfApplication11\DLL.mdb";

        }
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            LessonList.Add(new LessonInfo(false, textBox3.Text));
            listLesson.Items.Refresh();
        }
        public class LessonInfo
        {
            public LessonInfo(bool isVisited, string lessonName)
            {
                IsVisited = isVisited;
                LessonName = lessonName;
            }

            public Boolean IsVisited
            { get; set; }

            public String LessonName
            { get; set; }
        }
    
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            conn.Open();

            try
            {
                da = new OleDbDataAdapter("SELECT distinct sub FROM demo", conn);

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
            ds = new DataSet();

            da.Fill(ds);
            dt = ds.Tables[0];
            LessonList.RemoveRange(0, LessonList.Count());


            for (int i = 0; i < dt.Rows.Count; i++)
            {

                LessonList.Add(new LessonInfo(false, dt.Rows[i].ItemArray[0].ToString()));
                listLesson.Items.Refresh();

            }
            conn.Close();
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            textBox3.Text = listLesson.SelectedItem.ToString();               
        }
    }
}