public Course update(Course newCourse)
        {
            Course oldCourse = _repository.get(newCourse.IDCourse);

            if (oldCourse == null)
            {
                return(null);
            }
            oldCourse = CourseMapper.mapModel(oldCourse, newCourse);
            if (oldCourse == null)
            {
                return(null);
            }
            _repository.update(oldCourse);
            return(oldCourse);
        }