Passing the value of a bound list - windows-phone-7

Question

I had this code working before, but have somehow deleted it as I was trying to get something else fixed.
So I have a list which is bound as a View model, and the list has three lines on it.
I want to be able to click on the list, get the value of the third line on another page and use that value.
Here is the code for the selection of the list
private void List_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// If selected index is -1 (no selection) do nothing
if (List.SelectedIndex == -1)
return;
// Navigate to the new page
NavigationService.Navigate(new Uri("/Route.xaml?selectedItem=" + List.SelectedIndex, UriKind.Relative));
string urlWIthData = string.Format("/Route.xaml?name={0}", " ");
this.NavigationService.Navigate(new Uri(urlWIthData, UriKind.Relative));
// Reset selected index to -1 (no selection)
List.SelectedIndex = -1;
}
Then, on the route page I want to be able to get the value and use the value line three....
How do I do this?
EDIT:
so this one part of the list:
this.Items.Add(new ItemViewModel() { LineOne = "Images/1.png", LineTwo = "Whitehawk - County
Hospital - City Centre - Hove - Portslade - Mile Oak", LineThree = "1 Whitehawk - Mile Oak",
LineFour = "1 Mile Oak - Whitehawk", LineFive = "1149" });
I Display the list on one page :
<ListBox Margin="6,6,7,6" ItemsSource="{Binding Items}" Name="List" OpacityMask="#FFD38648" FontSize="26" SelectionChanged="List_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="0,0,0,17" DataContext="{Binding}">
<Image Name="Images" Source="{Binding LineOne}">
</Image>
<TextBlock Text="{Binding LineTwo}" Style="{StaticResource PhoneTextSubtleStyle}" Name="textblock3"></TextBlock>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

Answer 1

You can cast the list's SelectedItem to type Item and get the value from there:
private void List_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// If selected index is -1 (no selection) do nothing
if (List.SelectedIndex == -1)
return;
// Here's the codes -----------------------
var item = Items.SelectedItem as Item;
if(item == null) //cast didn't work
return;
var lineThree = item.LIneThree;
// end of the codes -----------------------
// Navigate to the new page
NavigationService.Navigate(new Uri("/Route.xaml?selectedItem=" + List.SelectedIndex, UriKind.Relative));
string urlWIthData = string.Format("/Route.xaml?name={0}", " ");
this.NavigationService.Navigate(new Uri(urlWIthData, UriKind.Relative));
// Reset selected index to -1 (no selection)
List.SelectedIndex = -1;
}