private async void AddFavorite_Tapped()
        {
            var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
            var email = (string)localSettings.Values["Email"];

            FavoriteService service = new FavoriteService();

            if (email != personCliked.Email) {
                try {
                    bool isCreated = await service.AddFavoriteAsync(email, personCliked.Email);

                    if (isCreated) {
                        _navigationService.NavigateTo("FavoriteDetails", personCliked);
                    } else {
                        //show error link already exist
                        ShowToast("favorite_link_exists");
                    }

                } catch (NoNetworkException e) {
                    ShowToast(e.ToString());
                }

            }
            else
            {
                //try to add himself in favorite
                ShowToast("add_himself_favorite");
            }