public void Update(StudentDTO studentDto)
 {
     _studentDal = new StudentDAL();
     _studentDal.Update(studentDto);
 }
 public void Save(StudentDTO studentDto)
 {
     _studentDal = new StudentDAL();
     _studentDal.Save(studentDto);
 }
 public StudentDTO GetById(int id)
 {
     _studentDal = new StudentDAL();
     return _studentDal.GetById(id);
 }
 public List<StudentDTO> GetList()
 {
     _studentDal = new StudentDAL();
     List<StudentDTO> list = _studentDal.GetList();
     return list;
 }
 public void Delete(int id)
 {
     _studentDal = new StudentDAL();
     _studentDal.Delete(id);
 }