public ContactEntity ToEntity()
        {
            var entity = new ContactEntity(new IdValueObject(Id), new ContactNameValueObject(FirstName, LastName));

            entity.AddEmailAddresses(Emails.Select(x => x.Email));
            entity.AddPhoneNumbers(Phones.Select(x => new Tuple <PhoneType, string>(x.PhoneType, x.PhoneNumber)));
            return(entity);
        }