public static void exampleList(List <CurrentAccount> list)
        {
            Address        address1 = new Address("FirstStreet", 1, "FirstCity", 12345);
            Client         client1  = new Client("Ed", "Small", 12345678910, address1);
            CurrentAccount account1 = new CurrentAccount(1000, client1, 1);

            Address        address2 = new Address("SecondStreet", 1, "SecondCity", 23456);
            Client         client2  = new Client("Jim", "Big", 54345678910, address2);
            CurrentAccount account2 = new CurrentAccount(500, client2, 2);

            list.Add(account1);
            list.Add(account2);
        }
        public static void addCurrentAccount(List <CurrentAccount> CurrentAccountsList, ref int idNumber)
        {
            CurrentAccount nextAccount = new CurrentAccount();

            nextAccount.setAccountDetails(ref idNumber);

            foreach (CurrentAccount account in CurrentAccountsList)
            {
                if (account.AccountOwner.Pesel == nextAccount.AccountOwner.Pesel)
                {
                    Console.WriteLine("Error. Client with " + nextAccount.AccountOwner.Pesel + " PESEL has already had Current Accout.");
                    break;
                }
                else
                {
                    CurrentAccountsList.Add(nextAccount);
                    Console.WriteLine("Account has been created.");
                    break;
                }
            }
        }