Two ListPicker, one TextBox. Result not displayed. Master-Detail?

Question

I have two ListPickers originating from one TextBox.

    private void textBox3_GotFocus(object sender, RoutedEventArgs e)
    {
        string a = "Domestic";
        string b = Convert.ToString(textBox2.Text);
        string c = "Foreign";

        if (b == a)
        {
            NavigationService.Navigate(new Uri("/ListPickerExchanges1.xaml", UriKind.Relative));
        }
        else if (b == c)
            {
                NavigationService.Navigate(new Uri("/ListPickerExchanges2.xaml", UriKind.Relative));
            }

Both ListPickers load and give you the option to choose something from the list. But only one ListPicker will displays the selection back into TextBox3 , and it is always the one under the second Else If (b == c) condition.

The ListPickerExchanges1 under the first condition will not display the selection back into textbox3.

But if i change the code under the second Else If condition to navigate to Exchanges1 instead of Exchanges2, then the Exchanges1 listpicker displays back the selection into textbox 3, and Exchanges2 does not.

Which means, Everything under the second condition works, and does not under the first condition.

Here is the code behind ListpickerExchanges1, which is intended to display the selection back into the textbox.

          public partial class ListPickerExchanges1 : PhoneApplicationPage
{
    public ListPickerExchanges1()
    {
        InitializeComponent();
        this.Loaded += new RoutedEventHandler(ListPickerExchanges1_Loaded);
    }
    private void ListPickerExchanges1_Loaded(object sender, RoutedEventArgse)
    {
        ListBoxExchanges.ItemsSource = Page2.ListExchanges;
    }
      public void Selection(object sender, System.Windows.Input.GestureEventArgs e)
    {
        ListBox myselecteditem4 = (ListBox)sender;
        ItemsModeling4 item4 = (ItemsModeling4)myselecteditem4.SelectedItem;            
        if (item4 != null)
        {
            NavigationService.Navigate(new Uri("/Broker.xaml?name4=" + item4.Exchanges, UriKind.RelativeOrAbsolute));
        }
         }

.............................................................................................................................................................. Update: Additional Code behind Navigation and Selection

    protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
    {
        base.OnNavigatedTo(e);
        string name4 = "";
        NavigationContext.QueryString.TryGetValue("name4", out name4);
        textBox3.Text = string.Format("{0}", name4);
    }        

..............................................................................................................................................................

    public Page2()
    {
        InitializeComponent();
        ListExchanges = new ObservableCollection<ItemsModeling4>();
        this.Loaded += new RoutedEventHandler(Page44_Loaded);
    }

..............................................................................................................................................................

    private void Page44_Loaded(object sender, RoutedEventArgs e)
    {
        if (ListExchanges.Count == 0)
        {
            string[] arrangeExchanges = new string[] { "Option1", "Option2", "Option3", "Option4" };
            foreach (string item4 in arrangeExchanges)
            {
                ListExchanges.Add(new ItemsModeling4 { Exchanges = item4 });
            }
        }
    }
    public static ObservableCollection<ItemsModeling4> ListExchanges { get; private set; }

..............................................................................................................................................................

public class ItemsModeling4
{
    public string Exchanges { get; set; }
}

.............................................................................................................................................................. Xaml

       <ListBox x:Name="ListBoxExchanges" Background="Transparent" 
         Tap="Selection">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel>
                <TextBlock Height="Auto" FontFamily="Segoe WP Semibold" FontSize="50" HorizontalAlignment="Left" Margin="12,0,0,0"
                Text="{Binding Exchanges}" VerticalAlignment="Top" />
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

What am i doing wrong here?

It Seems like a Master - Detail binding issue. I just don't see where or how to fix it.

The system doesn't give any errors, and I've checked everything with the debugger and everything seems fine. The listpickers work independently and i don't see where the code might intervene and stop the one from working. It all seems good to me. help

Answer 1

But if i change the code under the second Else If condition to navigate to Exchanges1 instead of Exchanges2, then the Exchanges1 listpicker displays back the selection into textbox 3, and Exchanges2 does not.

Are you sure that you are comparing culturaly correct strings? Try this compare instead for both of them.

if (String.Equals(a, b, InvariantCultureIgnoreCase))

See StringComparison Enumeration (System) and Best Practices for Using Strings in the .NET Framework for more info.

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Otherwise strings can be tricky with spaces. Try

String.Equals(a.Trim(), b.Trim());

to remove any spaces the user may be adding \r\n maybe?

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Frankly since the code knows about the choices it may be better to simply provide a ComboBox with the selectable choices for the user instead of using a TextBox.