private async void saveLessonToDB(object sender, EventArgs e) { string lessonNameValue = lessonName.Text; Option optionValue = (Option)optionPicker.SelectedItem; int teacher_id = App.currentTeacher.ID; Lesson lesson = new Lesson(lessonNameValue, teacher_id, optionValue.ID); if (!InputValidation(lessonNameValue, optionValue)) { return; } if (await lessonService.AddLessonToDB(lesson)) { await DisplayAlert("success", "Lesson added successfully", "Okay"); } else { await DisplayAlert("error", "An error occured, Please try again!", "try again!"); } }