void CreateSellTransaction(Guid walletID, string privateKeySeller, decimal amountWantToSell) { BitcoinSecret SellerWallet; var getPrivateKeySeller = walletDataAccess.FindWalletByPrivateKey(privateKeySeller); if (getPrivateKeySeller != null) { SellerWallet = new BitcoinSecret(getPrivateKeySeller.PrivateKey); // tao 1 trans muon ban // so luong amountWantToSell.ToString() phai tru vao object // sau do luu tru Transaction SellerWalletFunding = new Transaction() { Outputs = { new TxOut(amountWantToSell.ToString(), SellerWallet.GetAddress()) } }; var subtract = getPrivateKeySeller.BalanceAmount - amountWantToSell; getPrivateKeySeller.BalanceAmountTransaction = subtract; // tao mot transaction voi order luu vao db -> Done Order newOrderForSeller = new Order(); newOrderForSeller.OrderID = Guid.NewGuid(); newOrderForSeller.WalletID = walletID; newOrderForSeller.Amount = amountWantToSell; // here newOrderForSeller.CreatedDate = DateTime.Now; newOrderForSeller.ModifiedDate = DateTime.Now; orderDataAccess.CreateOrder(newOrderForSeller); } else { throw new Exception("Can't get object"); } }