WPF and Code Behind Issues

Question

Hello, I am trying to develop a simple gallery like application using C# -  WPF and SQL Server 2005. The issues I am having are:

1. I have designed the Listbox styles and data templates where I plan to show the images. 

The part of a datatemplate code:

<DataTemplate x:Key="GroupDataTemplate" >

            <Grid VerticalAlignment="Center" HorizontalAlignment="Center" Margin="6">

                <!-- Image Template -->

                <Border Padding="4" Background="White" BorderBrush="#22000000" BorderThickness="1">

                    <StackPanel Orientation="Horizontal">

                        <Image Source="{Binding Picture}"  Grid.Row="1" Margin="0" Height="200"/>

                        <Label Name="lblGroup" Content="{Binding Name}" HorizontalAlignment="Center"  Background="#FF13212F" VerticalAlignment="Center" Foreground="White" Height="175" Width="275"/>

                    </StackPanel>

                </Border>

            </Grid>

        </DataTemplate>

Tjhe parf of the ListBox Code:

        <GroupBox Grid.Column="0" Grid.Row="1">

            <ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Disabled">

                <ListBox 

                    ItemTemplate="{StaticResource GroupDataTemplate}" 

                    ItemsSource="{Binding Tables[0]}" 

                    IsSynchronizedWithCurrentItem="True"

                    Name="GroupListBox" 

                    Style="{StaticResource PhotoListBoxStyle}" 

                    Margin="10" 

                    SelectionMode="Extended" 

                    SelectedIndex="0"

                    MouseDoubleClick="GroupListBox_MouseDClick">

                </ListBox>

            </ScrollViewer>

        </GroupBox>

The Code behing in .cs file:

DataSet dtSet = new DataSet(); using (connection = new SqlConnection(connectionString)) {    

                command = new SqlCommand(sql, connection);

                SqlDataAdapter adapter = new SqlDataAdapter();

                connection.Open();

                adapter.SelectCommand = command;

                adapter.Fill(dtSet, "Product_Group");

                GroupListBox.DataContext = dtSet;

    }

First of all, I could not get the picture displayed the picture in the database. Second of all, How can I trap the Primary key the selected ListBoxItem so that I can show the next Window with the details of the Selected ListBox Item.

What I have done here but does not work is:

private void GroupListBox_MouseDClick(object sender, MouseButtonEventArgs e)

        {

            using (connection = new SqlConnection(connectionString))

            {

                connection.Open();

                DataSet ds = new DataSet();

                ListBoxItem lb = (GroupListBox.SelectedItem as ListBoxItem);

                SqlDataAdapter sqa = new SqlDataAdapter("Select Code from Product_Group where name='" + lb.Content + "'", connection);

                sqa.Fill(ds);

                connection.Close();

                this.Close();

            }

        }

I'd be grateful if I could any help. Thanking you in advance. :)