How to go back mainpage when press back button on device?

Question

i have an small windows phone application.

my application have a button and a listbox. my code below:

namespace PhoneApp1
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            listBox1.Items.Add("http://google.com");
        }

        private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            WebBrowserTask wbt = new WebBrowserTask();
            wbt.URL = listBox1.SelectedItem.ToString();
            wbt.Show();
        }
    }
}

My problem is when i press back button then item in my listbox no longer appear in my mainpage.

Can i keep item of listbox in mainpage when i press back button ?

Answer 1

Hi,

    You have the OnNavigatedTo  and OnNavigatedFrom events for your page.  In the OnNavigatedFrom , write logic to store the contents of listbox in a collection , and also store another variable (a boolean variable ) to indicate whether value exists.  

In the OnNavigatedTo , first check whether the variable is set , and if it is, then retrieve the contents of the listbox from the other stored collection.

Hope it Helps

 

Answer 2

Hi,

    You have the OnNavigatedTo  and OnNavigatedFrom events for your page.  In the OnNavigatedFrom , write logic to store the contents of listbox in a collection , and also store another variable (a boolean variable ) to indicate whether value exists.  

In the OnNavigatedTo , first check whether the variable is set , and if it is, then retrieve the contents of the listbox from the other stored collection.

Hope it Helps

 

Thanks your reply, it helped me!