using System;

 System.IO.FileStream

​

​

    public class CustInfo

    {

        public string FName { get; set; }

        public string Lname { get; set; }

​

        public OrderInfo[] orderInfo;

    }

    public class OrderInfo

    {

​

        public float Price { get; set; }

        public int Order_Qty { get; set; }

        public Vehicle vehicle { get; set; }

    }

    public class Vehicle

    {

        public string Description { get; set; }

        public int Wheels { get; set; }

        public int HorsePower { get; set; }

        public virtual double CargoCap() { return 0; }//cargo Cap  is override in Automobile and Motorcycle

    }

    public class Automobile : Vehicle

    {

​

        public double Cargo_Capacity, Length, Width, Height;

        public override double CargoCap()

        {

            Cargo_Capacity = Length * Width * Height;

            return Math.Round(Cargo_Capacity, 2);

        }

​

    }

    public class Motorcycle : Vehicle

    {

        public double Cargo_Capacity, Radius, Height;

        public override double CargoCap()

        {

            Cargo_Capacity = (Math.PI * (Radius * Radius) * Height) * 2;

            return Math.Round(Cargo_Capacity, 2);

        }

    }

    public class Program

    {

        public static void Main(string[] args)

        {

            //Customer1 have Order 1 for Motorcycle

​

            FileStream outstream;

            StreamWriter streamwriter;

            TextWriter oldOut = Console.Out;

            try

            {

                outstream = new FileStream("./Output.txt", FileMode.OpenOrCreate, FileAccess.Write);

                streamwriter = new StreamWriter(outstream);

            }

            catch (Exception e)

            {

                Console.WriteLine("Oops! Cannot open text file for writing");

                Console.WriteLine(e.Message);

                Console.ReadKey();

                return;

            }

            //Console.SetOut(streamwriter);

​

            CustInfo[] customer = new CustInfo[10];

            CustInfo customer1 = new CustInfo { FName = "Henry", Lname = "Desusa", orderInfo = new OrderInfo[1] };

            customer[0] = customer1;

            OrderInfo Cust1item1 = new OrderInfo { Order_Qty = 1, Price = 10000, vehicle = new Motorcycle { Radius = 10, Height = 2, Description = "Herley Davidson- Iron 883", HorsePower = 15 } };

            customer1.orderInfo[0] = Cust1item1;

​

            //Customer2 have order 1 for Automobile

            CustInfo customer2 = new CustInfo { FName = "Joe", Lname = "Cowdry", orderInfo = new OrderInfo[2] };

            customer[1] = customer2;

            OrderInfo Cust2item1 = new OrderInfo { Order_Qty = 1, Price = 45000, vehicle = new Automobile { Length = 5, Width = 3, Height = 2, Description = "Ferrari 458", HorsePower = 50 } };

            customer2.orderInfo[0] = Cust2item1;

​

            //Customer2 have order 2 Motorcycle

            OrderInfo Cust2item2 = new OrderInfo { Order_Qty = 1, Price = 21000, vehicle = new Motorcycle { Radius = 5, Height = 5, Description = "Honda- GOLD WING F6B", HorsePower = 20 } };

            customer2.orderInfo[1] = Cust2item2;

​

​

            Console.WriteLine("\n\n\n\n\t\t\tOrder Information Form\n\n");

            Console.Write("\n\t\t\t----------------------\n\n\n");

            Console.WriteLine();

​

            for (int i = 0; i < customer.Length; i++)

            {

                if (customer[i] != null)// Check for Null reference 

                {

                if (i > 0)

                {

                    Console.WriteLine("\n\n");

                    Console.Write("\n****-------New Customer-------****\n\n\n");

                    Console.WriteLine();

                }

                Console.WriteLine();

                Console.WriteLine("\nCustomer Name: {0} {1}\n", customer[i].FName, customer[i].Lname);

                Console.WriteLine("\n----------------------------\n");

                for (int j = 0; j < customer[i].orderInfo.Length; j++)

                {

                    if (customer[i].orderInfo[j] != null)// Check for Null reference 

                    {

                    Console.WriteLine();

                    Console.WriteLine("\nDescription: {0}", customer[i].orderInfo[j].vehicle.Description);

                    Console.WriteLine("------------");

                    Console.WriteLine("\nPrice\t\tQuantity\tHorse Power\tCargoCapacity\n");

                    Console.WriteLine("{0:C2}\t{1}\t\t{2}\t\t{3}\n\n",

                                       customer[i].orderInfo[j].Price, customer[i].orderInfo[j].Order_Qty, customer[i].orderInfo[j].vehicle.HorsePower, customer[i].orderInfo[j].vehicle.CargoCap());

                    }

                }

                }

​

            }

            Console.SetOut(oldOut);

            streamwriter.Close();

            outstream.Close();

            Console.WriteLine("Please check the file Output.txt in Project Folder for Output");

            Console.ReadKey();

        }

    }

​