private async void ListView_OnItemTapped(object sender, ItemTappedEventArgs e)
{
TambahBarangPage tambahPage = new TambahBarangPage();
Barang item = (Barang)e.Item;
tambahPage.BindingContext = item;
((ListView)sender).SelectedItem = null;
await Navigation.PushAsync(tambahPage);
}
private async void MenuItem_OnClicked(object sender, EventArgs e)
{
TambahBarangPage tambahPage = new TambahBarangPage(true);
await Navigation.PushAsync(tambahPage);
}