public void Add(Guid studentId, Guid courseId)
        {
            using (var transaction = _unitOfWork.BeginTransaction())
            {
                try
                {
                    var course  = _unitOfWork.Context.Courses.FirstOrDefaultAsync(c => c.Id == courseId).Result;
                    var student = _unitOfWork.Context.Students.FirstOrDefaultAsync(s => s.Id == studentId).Result;

                    var studentCourse = StudentCourse.Create(student, course);
                    student.RegistreStudent(studentCourse);

                    _unitOfWork.Context.Students.Update(student);
                    _unitOfWork.Commit();
                }
                catch (Exception ex)
                {
                    _unitOfWork.Rollback();
                    throw;
                }
            }
        }