public object Add(object item) { W1Payment w1Payment = (W1Payment)item; using (BookMarketDbContext db = new BookMarketDbContext()) { db.AddW1Payment( w1Payment.WMI_MERCHANT_ID, w1Payment.WMI_CURRENCY_ID, w1Payment.WMI_DESCRIPTION, w1Payment.WMI_EXPIRED_DATE, w1Payment.WMI_PAYMENT_AMOUNT, w1Payment.WMI_SIGNATURE); } return GetAll().w1Payments.Last(); }