private async void LvSuggestions_ItemTapped(object sender, ItemTappedEventArgs e)
{
var obj = e.Item as City;
var dw = new DisplayWeaher(obj.Id);
await this.Navigation.PushModalAsync(dw);
}
private void displayWeather(int cityId)
{
var dw = new DisplayWeaher(cityId);
this.Navigation.PushAsync(dw);
}