private async void BtnSaveAndNew_Click(object sender, RoutedEventArgs e)
 {
     if (await AddTransaction())
     {
         Reset();
         TxtStore.Focus();
     }
     else
     {
         AppState.DisplayNotification("Unable to process transaction.", "Fuel Tracker");
     }
 }
 public AddTransactionPage()
 {
     InitializeComponent();
     TxtStore.Focus();
 }