How to go to previous page in windows phone 8 when back button is pressed

Question

I have a home page or landing page in my windows phone c# based app where user enters login details and upon successful login user is redirected to page2 . Here the user will see a list box with few items . Upon selecting an item from this list box a new
page called "Threadx" opens.(where x is the each page that opens upon clicking the x item in the list box)
While user is on this Thread page "Threadx" he may receive the toast notifications and the thread gets updated with new replies or answers on that thread.
But When user clicks on back button the "ThreadX" page doesn't get closed and instead it goes to its previous state where it has less number of messages , and so on until the app gets closed.
protected override void OnNavigatedTo(NavigationEventArgs e)
base.OnNavigatedTo(e);
if (e.NavigationMode == NavigationMode.Back)
return;
I would like to know if this "Threadx" page can be closed upon clicking back button without affecting other "Threadx+1","Threadx+2"..."Threadx+n" pages.
Any help would be really appreciated.

Answer 1

you don't need to navigate explicitly. Just clear the back stack till your specific page and say goback. below is the  code you can use.
 protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
                    e.cancel=true;
                RemoveBackStackTillSpecificPage("page2.xaml");
                GoBack();
public static void RemoveBackStackTillSpecificPage(string pageName)
PhoneApplicationFrame frame = Application.Current.RootVisual as PhoneApplicationFrame;
var previousPage = frame.BackStack.FirstOrDefault();
if (previousPage != null && previousPage.Source != null)
                while (!previousPage.Source.ToString().Contains(pageName))
                    frame.RemoveBackEntry();
                    previousPage = frame.BackStack.FirstOrDefault();
        public static void GoBack()
            PhoneApplicationFrame frame = Application.Current.RootVisual as PhoneApplicationFrame;
            LastPageUri = frame.Source;
            frame.GoBack();
Please mark this as answer if this answers your question
Purushothama V S