public void WithDraw(int accNo, decimal amount, string comment)
{
if (amount <= 0)
{
throw new ArgumentException(
"amount to withdraw must be greater than 0");
}
Account acc = Impl.GetAccountByAccountNumber(accNo);
if (acc is null)
{
throw new ArgumentException(
"the specified account does not exist");
}
decimal serviceFee = 0;
if (TMImpl.CountChargedTransactions() >=
TransactionManager.NFreeTransactions)
{
serviceFee = TransactionManager.ServiceFee['W'];
}
if (acc.Balance - amount - serviceFee < MinBalance[acc.AccountType])
{
throw new BalanceTooLowException(
"after withdrawal (including service fee), remaining balance "
+ "would be lower than the minimum balance allowed.");
}
Impl.WithDraw(accNo, amount, comment, serviceFee);
}
public void Transfer(int srcNo, int destNo, decimal amount,
string comment)
{
if (amount <= 0)
{
throw new ArgumentException(
"amount to transfer must be greater than 0");
}
Account srcAcc = Impl.GetAccountByAccountNumber(srcNo);
if (srcAcc is null)
{
throw new ArgumentException(
"account to transfer from does not exist");
}
Account destAcc = Impl.GetAccountByAccountNumber(destNo);
if (destAcc is null)
{
throw new ArgumentException(
"account to transfer to does not exist");
}
decimal serviceFee = 0;
if (TMImpl.CountChargedTransactions() >=
TransactionManager.NFreeTransactions)
{
serviceFee = TransactionManager.ServiceFee['T'];
}
if (srcAcc.Balance - amount - serviceFee
< MinBalance[srcAcc.AccountType])
{
throw new BalanceTooLowException(
"after transfer (including service fee), remaining balance "
+ "would be lower than the minimum balance allowed.");
}
Impl.Transfer(srcNo, destNo, amount, comment, serviceFee);
}