void Handle_Submit(object sender, ClickedEventArgs e) { if (String.IsNullOrWhiteSpace(fName.Text) || String.IsNullOrWhiteSpace(lName.Text)) { DisplayAlert("Warning", "You must enter a Full Name", "Close"); } else { temp = new Contact { Id = intialId, FirstName = fName.Text, LastName = lName.Text, Phone = phone.Text, Email = email.Text, Blocked = isBlocked.IsToggled }; if (intialId > _contacts.GetAllContacts().Last().Id) { _contacts.AddContact(temp); } else { _contacts.UpdateContact(temp); } Navigation.PopAsync(); } }