lictpicker value is lost in wp8 c#

Question

In my windows phone 8 application I am using listpicker that have two values Dark and Light, when I select Light from listpicker and restart my application, listpicker value i.e Light is lost and it holds default value i.e Dark.

And below is listpicker selectionChanged method:

private void themelistPicker1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            string themename = string.Empty;
            IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
            ListPickerItem lpi = (sender as ListPicker).SelectedItem as ListPickerItem;
            themename = lpi.Content.ToString();
            value = lpi.Content.ToString();
            if (themename == "Dark")
            {
                if (!settings.Contains("userData"))
                {
                    settings.Add("userData", themename);
                }
                else
                {
                    settings["userData"] = themename;
                }
                settings.Save(); 
            }
            else
            {

                if (!settings.Contains("userData"))
                {
                    settings.Add("userData", themename);
                }
                else
                {
                    settings["userData"] = themename;
                }
                settings.Save();
            }
        }  

What can I do, Kindly suggest me. Waiting for reply.

Thanks

Answer 1

try this:

XAML:

        <toolkit:ListPicker x:Name="themelistPicker1" SelectionChanged="themelistPicker1_SelectionChanged">
            <toolkit:ListPickerItem Content="Light"></toolkit:ListPickerItem>
            <toolkit:ListPickerItem Content="Dark"></toolkit:ListPickerItem>
        </toolkit:ListPicker>

CS:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
    if (settings.Contains("userData"))
    {
        string str = settings["userData"].ToString();
        if (str == "Dark")
            themelistPicker1.SelectedIndex = 1;
        else
            themelistPicker1.SelectedIndex = 0;
    }
    base.OnNavigatedTo(e);
}
private void themelistPicker1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (themelistPicker1 != null && themelistPicker1.SelectedIndex > -1)
    {
        IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
        ListPickerItem lpi = (sender as ListPicker).SelectedItem as ListPickerItem;
        string themename = lpi.Content.ToString();
        if (!settings.Contains("userData"))
            settings.Add("userData", themename);
        else
            settings["userData"] = themename;
        settings.Save();
    }
}