void DeleteCard()
    {
        clsCardsCollection CardBook = new clsCardsCollection();

        CardBook.ThisCard.Find(CardNr);
        CardBook.Delete();
    }
        public void DeleteMethodOK()
        {
            clsCardsCollection AllCards = new clsCardsCollection();

            clsCard TestItem = new clsCard();

            double PrimaryKey = 0;

            TestItem.Active             = true;
            TestItem.CardNr             = 945345634563456;
            TestItem.CardHolder         = "Cezary Szwalbe";
            TestItem.CardSecurityNumber = 123;
            TestItem.ExpireDateYear     = DateTime.Now.Year;
            TestItem.ExpireDateMonth    = DateTime.Now.Month;

            AllCards.ThisCard = TestItem;
            PrimaryKey        = AllCards.Add();
            TestItem.CardNr   = PrimaryKey;
            AllCards.ThisCard.Find(PrimaryKey);
            AllCards.Delete();

            Boolean Found = AllCards.ThisCard.Find(PrimaryKey);

            Assert.IsFalse(Found);
        }