public IEnumerable <ContactResponseDTO> FindAll() { IEnumerable <ContactsEntity> contacts = _contactsRepo.FindAll(); if (contacts.Count() == 0) { return(null); } List <ContactResponseDTO> contactResponse = new List <ContactResponseDTO>(); foreach (ContactsEntity contact in contacts) { ContactResponseDTO contactResponseDTO = _contactsMapper.convertEntityToDTO(contact); contactResponse.Add(contactResponseDTO); } return(contactResponse); }