private async void AddItem_Clicked(object sender, EventArgs e)
{
Bill bill = new Bill();
BillDetailPage BillPage = new BillDetailPage();
BillPage.BindingContext = bill;
await Navigation.PushAsync(BillPage);
}
private async void OnItemSelected(object sender, SelectedItemChangedEventArgs e)
{
Bill selectedBill = (Bill)e.SelectedItem;
BillDetailPage billPage = new BillDetailPage(selectedBill.Id);
billPage.BindingContext = selectedBill;
await Navigation.PushAsync(billPage);
}
