/// <summary>
        /// Invoked when application execution is being suspended.  Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private void OnSuspending(object sender, SuspendingEventArgs e)
        {
            var deferral = e.SuspendingOperation.GetDeferral();

            //TODO: Save application state and stop any background activity

            //  Sae the student details before suspending.
            BusinessLayer.IStudentBLL BLL = new BusinessLayer.StudentBLL((App.Current as App).GetRepository());
            BLL.PersistStudents();
            //RemoveFile();
            //this.PersistStudents();

            //  Save the searches
            BusinessLayer.ISearchBLL searchBll = new BusinessLayer.SearchBLL((App.Current as App).GetSearchRepository());
            searchBll.SaveSearches();

            deferral.Complete();
        }
        /// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used when the application is launched to open a specific file, to display
        /// search results, and so forth.
        /// </summary>
        /// <param name="args">Details about the launch request and process.</param>
        protected override void OnLaunched(LaunchActivatedEventArgs args)
        {
            Frame rootFrame = Window.Current.Content as Frame;

            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (rootFrame == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();

                if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    //TODO: Load state from previously suspended application
                }

                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
            }

            if (rootFrame.Content == null)
            {
                // When the navigation stack isn't restored navigate to the first page,
                // configuring the new page by passing required information as a navigation
                // parameter
                if (!rootFrame.Navigate(typeof(MainPage), args.Arguments))
                {
                    throw new Exception("Failed to create initial page");
                }
            }

            //  Call the loadstudents method.
            BusinessLayer.IStudentBLL BLL = new BusinessLayer.StudentBLL((App.Current as App).GetRepository());
            BLL.LoadStudents();
            BusinessLayer.ISearchBLL searchBll = new BusinessLayer.SearchBLL((App.Current as App).GetSearchRepository());
            searchBll.LoadSearches();

            // Ensure the current window is active
            Window.Current.Activate();
        }
        /// <summary>
        /// Invoked when application execution is being suspended.  Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private void OnSuspending(object sender, SuspendingEventArgs e)
        {
            var deferral = e.SuspendingOperation.GetDeferral();
            //TODO: Save application state and stop any background activity

            //  Sae the student details before suspending.
            BusinessLayer.IStudentBLL BLL = new BusinessLayer.StudentBLL((App.Current as App).GetRepository());
            BLL.PersistStudents();
            //RemoveFile();
            //this.PersistStudents();

            //  Save the searches
            BusinessLayer.ISearchBLL searchBll = new BusinessLayer.SearchBLL((App.Current as App).GetSearchRepository());
            searchBll.SaveSearches();

            deferral.Complete();
        }
        /// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used when the application is launched to open a specific file, to display
        /// search results, and so forth.
        /// </summary>
        /// <param name="args">Details about the launch request and process.</param>
        protected override void OnLaunched(LaunchActivatedEventArgs args)
        {
            Frame rootFrame = Window.Current.Content as Frame;

            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (rootFrame == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();

                if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    //TODO: Load state from previously suspended application
                }

                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
            }

            if (rootFrame.Content == null)
            {
                // When the navigation stack isn't restored navigate to the first page,
                // configuring the new page by passing required information as a navigation
                // parameter
                if (!rootFrame.Navigate(typeof(MainPage), args.Arguments))
                {
                    throw new Exception("Failed to create initial page");
                }
            }

            //  Call the loadstudents method.
            BusinessLayer.IStudentBLL BLL = new BusinessLayer.StudentBLL((App.Current as App).GetRepository());
            BLL.LoadStudents();
            BusinessLayer.ISearchBLL searchBll = new BusinessLayer.SearchBLL((App.Current as App).GetSearchRepository());
            searchBll.LoadSearches();

            // Ensure the current window is active
            Window.Current.Activate();
        }