public static void WithdrawMoney(decimal amount, string cardPin, string cardNumber)
{
using (var atmEntities = new ATMEntities())
{
using (var transaction = atmEntities.Database.BeginTransaction())
{
var currentCard = atmEntities.CardAccounts.FirstOrDefault(c => c.CardNumber == cardNumber && c.CardPIN == cardPin);
if (currentCard == null)
{
transaction.Rollback();
throw new ArgumentNullException("There are no Card Account in database with this Pin or card number.");
}
if (currentCard.CardCash < amount)
{
transaction.Rollback();
throw new InvalidOperationException("You don't have enough money.");
}
currentCard.CardCash -= amount;
LogWithdrawalTransaction(cardNumber, amount);
atmEntities.SaveChanges();
transaction.Commit();
Console.WriteLine("Transaction completed.");
}
}
}
private static void LogWithdrawalTransaction(string cardNumber, decimal amount)
{
using (var atmEntities = new ATMEntities())
{
atmEntities.TransactionHistories.Add(
new TransactionHistory { Amount = amount, CardNumber = cardNumber, TransactionDate = DateTime.Now });
atmEntities.SaveChanges();
}
}
static void Main(string[] args)
{
var account = new CardAccount();
account.CardNumber = "9876543";
account.CardPin = "22222";
decimal transactionMoney = 500;
var tran = new TransactionScope();
using (tran)
{
try
{
var dbCon = new ATMEntities();
var card = (from c in dbCon.CardAccounts
where c.CardNumber == account.CardNumber
select c).FirstOrDefault();
if (card == null)
{
throw new InvalidOperationException(" Current Card does not exist! ");
}
else
{
if (account.CardPin == card.CardPin)
{
if (account.CardCash > 200 && account.CardCash - transactionMoney > 0)
{
account.CardCash -= transactionMoney;
dbCon.CardAccounts.Attach(account);
dbCon.SaveChanges();
}
else
{
throw new ArgumentException("There are not enough money in your card!");
}
}
else
{
throw new ArgumentException("Wrong Pin! Try again!");
}
}
}
catch (Exception ex)
{
Console.WriteLine("Transaction was not completed successfully! " + ex.Message.ToString());
}
}
}