private async Task Update() { bool result = await UniversityServiceApi.UpdateItem <Students>(controller, st, st.id); if (result) { await App.Current.MainPage.DisplayAlert("Success!", "The student was updated successfuly!", "Ok"); await App.Current.MainPage.Navigation.PopAsync(); } else { await App.Current.MainPage.DisplayAlert("Failed!", "The student was NOT updated!", "Ok"); } }