public void TransferAmount() { User fromUser = this.bankUsers[this.fromUser]; User toUser = this.bankUsers[this.toUser]; IAccountEntity toAccount = toUser.CheckStatus(this.toAccountType) as IAccountEntity; IAccountEntity fromAccount = fromUser.CheckStatus(this.fromAccountType) as IAccountEntity; toAccount.SetCurrentAmount(toAccount.GetCurrentAmount() + this.transferAmount); fromAccount.SetCurrentAmount(fromAccount.GetCurrentAmount() - this.transferAmount); // create operations on both accounts for transfer.// OperationBuilder operationBuilder = new OperationBuilder() .SetType("TransferOperation") .SetAmount(this.transferAmount) .SetPayee(this.toUser); fromAccount.PushOperation(operationBuilder.Build()); operationBuilder = new OperationBuilder() .SetType("DepositOperation") .SetAmount(this.transferAmount) .SetPayee(this.fromUser); toAccount.PushOperation(operationBuilder.Build()); }