varmaphone

if write both better for every appliction to maintaing state temprarly
-----------------------------------------------------------------------

1)to store data in temparary
----------------------------
 PhoneApplicationService phappserv = PhoneApplicationService.Current;


         protected override void  OnNavigatedFrom(System.Windows.Navigation.NavigationEventArgs e)
         {
            phappserv.State["myvalue"] = textBox1.Text;
             base.OnNavigatedFrom(e);
         }

         protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
         {
             object somevalue ="";
             if (phappserv.State.ContainsKey("myvalue"))
             {
                 if (phappserv.State.TryGetValue("myvalue", out somevalue))
                 {
                     textBox1.Text = somevalue.ToString();
                 }
             }
             base.OnNavigatedTo(e);
         }





2)tostore data for longterm
--------------------------

in app.xaml
-------------

helper methods
---------------

  private void savestate()
    {
        PhoneApplicationService phoneappservice = PhoneApplicationService.Current;

       IsolatedStorageSettings   settings = IsolatedStorageSettings.ApplicationSettings;
        settings["myvalue"] = phoneappservice.State["myvalue"];
    }

    private void loadstate()
    {
        PhoneApplicationService phoneappservice = PhoneApplicationService .Current;

        IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;

        string myvalue = "";
        if(settings.TryGetValue<string>("myvalue",out myvalue))
        {
             phoneappservice.State["myvalue"] = myvalue;
        }
      
    }

call these methods under
------------------------

 private void Application_Launching(object sender, LaunchingEventArgs e)
        {
             loadstate();
        }

        // Code to execute when the application is activated (brought to foreground)
        // This code will not execute when the application is first launched
        private void Application_Activated(object sender, ActivatedEventArgs e)
        {
            loadstate();
        }

        // Code to execute when the application is deactivated (sent to background)
        // This code will not execute when the application is closing
        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        {
            savestate();
        }

        // Code to execute when the application is closing (eg, user hit Back)
        // This code will not execute when the application is deactivated
        private void Application_Closing(object sender, ClosingEventArgs e)
        {
            savestate();
        }


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synario: for example few files are there in isolated storage

prob:  how to get filenames,which are stored in isolated storage

sol:
    

        isolatedstoragefile(variablename) = IsolatedStorageFile.GetuserStoreforappication();

         
         listbox.itemssource = isolatedstoragefile.GetFilenames();

        //we need bind the property in the souce code also
           
       i.e,(Content="{Binding})

             <ListBox Height="200" HorizontalAlignment="Left" Margin="12,25,0,0" Name="listBox1"

VerticalAlignment="Top" Width="460" Background="Red" Visibility="Collapsed">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                           
                            <HyperlinkButton Content="{Binding}" Click="HyperlinkButton_Click" >
                               
                            </HyperlinkButton>
                        </DataTemplate>
                    </ListBox.ItemTemplate>

                </ListBox>


      in listbox i have links visible like this


                file1.txt
                ---------

                file2.txt
                ---------

                file3.txt
                ---------
  when user clicks any file he need to navigate another page with relavent filename with relavent content for that

the below code

          private void HyperlinkButton_Click(object sender, RoutedEventArgs e)
        {
            // i need to write code here............

            HyperlinkButton  h = (HyperlinkButton)sender;

            // i am contructing the uri

            string uri = string.Format("/WindowsraviPhoneApplication2;component/Page1.xaml?id={0}", h.Content);

            NavigationService.Navigate(new Uri(uri, UriKind.Relative));



        }


  in the destination load event the code as follows

  -------------------------------------------------

 private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
        {
            IsolatedStorageFile isostrofile = IsolatedStorageFile.GetUserStoreForApplication();
            string filename = "";
           // string filename = NavigationContext.QueryString["id"];

           if(NavigationContext.QueryString.TryGetValue("id",out filename))
           {
             
            using (var file = isostrofile.OpenFile(filename, System.IO.FileMode.Open, FileAccess.Read))
            {
                StreamReader sr = new StreamReader(file);
               textBlock1.Text = sr.ReadToEnd();
            }
           }
            
        }


http://blogs.msdn.com/b/mingfeis_code_block/archive/2010/10/03/windows-phone-7-how-to-store-data-and-pass-data-

between-pages.aspx



  http://innovativesingapore.com/2010/09/code-how-to-store-data-and-pass-data-in-windows-phone/(data sotre permentely)