Trial version implementation

trial4.cs

//This function is called whenever we navigate to this page.
        //In this function we check whether the appliaction is in trial mode or is running in full license.

        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);

            if ((Application.Current as App).IsTrial)
            {
                //show the status
                statusblock.Text = "Trial version";
                //add the buy button
                buybutton.Visibility = Visibility.Visible;
            
                //disable the second button as it is not available in trial state
                secondbutton.IsEnabled = false;

            }
            else
            {
                //show the status
                statusblock.Text = "Full version";
                
                //remove the buy button
                buybutton.Visibility = Visibility.Collapsed;

                //enable the second button as it is available in full version
                secondbutton.IsEnabled = true;
            }
        }

        //Event handler for first button
        private void Firstbuttonclick(object sender, RoutedEventArgs e)
        {
            NavigationService.Navigate(new Uri("/Firstpage.xaml", UriKind.Relative));
        }

        //Event handler for second button
        private void Secondbuttonclick(object sender, RoutedEventArgs e)
        {
            NavigationService.Navigate(new Uri("/Secondpage.xaml", UriKind.Relative));
        }


        //Event handler for buy button
        private void buybuttonclick(object sender, RoutedEventArgs e)
        {
         //Task to launch the market place so that user can buy full version of this app
          MarketplaceDetailTask marketdetailtask = new MarketplaceDetailTask();
          marketdetailtask.Show();
        }