public List <StudentDAO> GetStudents()
        {
            var students = new List <StudentDAO>();

            foreach (var st in db.GetStudents())
            {
                students.Add(DataMapper.MapToStudentDAO(st));
            }

            return(students);
        }
        public List <StudentDAO> ListEnrolledStudents(int sessionId)
        {
            List <StudentDAO> studentsDAO = new List <StudentDAO>();

            var students = db.ListEnrolledStudents(sessionId);

            foreach (var st in students)
            {
                studentsDAO.Add(DataMapper.MapToStudentDAO(st));
            }

            return(studentsDAO);
        }