public static async Task <bool> AddLesson(Lesson lesson, string year = null, string term = null)
{
var lessonList = ((App)App.Current).LessonList;
lessonList.Add(lesson);
SQLiteService.InsertLesson(lesson.id, lesson.courseId, lesson.week, lesson.day, lesson.homework, lesson.studyMaterial, lesson.studyState);
return(true);
}