static void Main(string[] args)
        {
            FinancedAutomobile[] automobiles = new FinancedAutomobile[2];
            double grandTotal         = 0;
            double grandTotalFinanced = 0;
            bool   goodNumber;

            for (int i = 0; i < automobiles.Length; i++)
            {
                automobiles[i] = new FinancedAutomobile();
                Write("Enter automobile ID number >> ");
                automobiles[i].IdNumber = int.Parse(ReadLine());
                goodNumber = true;
                for (int j = 0; j < i; j++)
                {
                    if (automobiles[i].Equals(automobiles[j]))
                    {
                        goodNumber = false;
                    }
                }
                while (!goodNumber)
                {
                    Write("Sorry, the ID number " + automobiles[i].IdNumber + " is a duplicate. " + "\nPlease reenter >> ");
                    automobiles[i].IdNumber = int.Parse(ReadLine());
                    goodNumber = true;
                    for (int j = 0; j < i; j++)
                    {
                        if (automobiles[i].Equals(automobiles[j]))
                        {
                            goodNumber = false;
                        }
                    }
                }
                Write("Enter make >> ");
                automobiles[i].Make = ReadLine();
                Write("Enter year >> ");
                automobiles[i].Year = int.Parse(ReadLine());
                Write("Enter price >> ");
                automobiles[i].Price = double.Parse(ReadLine());
                Write("Enter amount financed >> ");
                automobiles[i].AmtFinanced = double.Parse(ReadLine());
                if (automobiles[i].AmtFinanced > automobiles[i].Price)
                {
                    WriteLine("Amount financed is too large - charging to {0}", automobiles[i].Price.ToString("c"));
                    automobiles[i].AmtFinanced = automobiles[i].Price;
                }
                WriteLine("\n");
            }
            WriteLine("\n\t\t\tSUMARY");
            Array.Sort(automobiles);
            for (int i = 0; i < automobiles.Length; i++)
            {
                WriteLine(automobiles[i].ToString());
                WriteLine("\tPayment is {0}", automobiles[i].GetPaymentAmount().ToString("c"));
                grandTotal         += automobiles[i].Price;
                grandTotalFinanced += automobiles[i].AmtFinanced;
            }
            WriteLine("Total for all Automobile is >> " + grandTotal.ToString("c"));
            WriteLine("Total financed all Automobile is >> " + grandTotalFinanced.ToString("c"));
        }
        static double GetPaymentAmount(this FinancedAutomobile fa)
        {
            const int PMTS = 24;

            return(fa.AmtFinanced / PMTS);
        }