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NavigationService GetNavigationService

<Page x:Class="NavigationApplication.Page3"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="Page3" WindowTitle="Page3" Loaded="Init">   <StackPanel Margin="3" Name="pnl">     <TextBlock Margin="3" TextWrapping="Wrap">       This is a Page3.xaml.       Click <Hyperlink NavigateUri="Menu.xaml">here</Hyperlink> to go to the Menu.     </TextBlock>   </StackPanel> </Page> //File:Window.xaml.cs using System; using System.Collections.Generic; 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; namespace NavigationApplication {     public partial class Page3 : System.Windows.Controls.Page     {         public Page3()         {             InitializeComponent();         }         private void Init(object sender, EventArgs e)         {             NavigationService nav = NavigationService.GetNavigationService(this);             while (nav.CanGoBack)             {                 ;             }         }     } }