public CursusDTO AddCursus(CursusCreateUpdateDTO cursus) { var newCursus = _cursusMapper.MapToModel(cursus); var createdCursus = _repositoryCursus.AddCursus(newCursus); try { _repositoryCursus.SaveChanges(); } catch (DbUpdateException) { return null; } catch (Exception e) { throw new Exception(e.Message); } return _cursusMapper.MapToDTO(createdCursus); }