Message Box

Hi

Is there a way i can read my json file stored in my folder in the message box i have tried the with the code below but keeps getting error

//Message box code

List strings = new List() {    "Friday 16Th 6PM", "Sunday 18TH 10AM & 7PM", "Wednesday 21st 6PM", "Friday 23RD 6PM", "Sunday 25th 10AM & 7PM", "Wednesday 28th 6PM", "Friday 30th 6PM", };
       
        public ListPicker()
        {
            InitializeComponent();

            lbx.ItemsSource = strings;
            lbx.SelectionChanged += lbx_SelectionChanged;

        }

        void lbx_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {

            value = lbx.SelectedIndex;
            switch (value)
            {
                case 0:MessageBox.Show("");
                    break;
                case 1: MessageBox.Show("");
                    break;
                case 2: MessageBox.Show(" ");
                    break;
                case 3: MessageBox.Show(" ");
                    break;
                case 4: MessageBox.Show(" ");
                    break;
                case 5: MessageBox.Show("");
                    break;
               
            }
        }

        public int value { get; set; }

//Json file reference code

        string filepath = @"Assets\resources.json";
                        StorageFolder folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
                        StorageFile file = await folder.GetFileAsync(filepath); // error here
                        var data = await Windows.Storage.FileIO.ReadTextAsync(file);

Thank you in advance and reply soon