public void Delete()
        {
            m_customer_contract_person existing = _repository.Find(x => x.ID == this.ID).FirstOrDefault();

            if (existing != null)
            {
                _repository.Delete(existing);
            }
        }
        public void Update()
        {
            m_customer_contract_person existing = _repository.Find(x => x.ID == this.ID).FirstOrDefault();

            _repository.Edit(existing, this);
        }