public class Card
    {
        public int Id { get; set; }
        
        public int CardNumber { get; set; }

        public virtual Person Person { get; set; }
    }

    public class Person
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public System.DateTime Date { get; set; }

    }

        public DataTable GetAll()
        {
            using (var context = new MyDbContext())
            {
                IList<Card> cards = context.Cards.ToList();

                return cards.ToDataTable<Card>();
            }
        }

        ClubMember personModel = new Person()
                    {
                        Id = 0,
                        Name = txtName.Text.Trim(),
                        Date = System.DateTime.Now,
                        TimeBack = null,
                        Follower = txtFollower.Text.Trim(),
                        Direction = txtDirection.Text.Trim(),
                        WhoGiveAndSerial = txtWhoGiveAndSerial.Text.Trim(),
                    };
                    Card cardModel = new Card()
                    {
                        Id = 0,
                        CardNumber = Convert.ToInt32(nmcCardNumber.Text.Trim()),
  *                      Person = personModel,
                    };

        public bool Create(Card card)
        {
            using (var context = new MyDbContext())
            {
                context.Cards.Add(card);
                return context.SaveChanges() > 0;
            }
        }