using System;

using System.Collections.Generic;

using System.Linq;

                    //test

public class Program

{

    private static List<Order> Orders = new List<Order> {

        new Order {

            Num = "1",

            CustomerNum = "ABC123",

            OrderDate = DateTime.Now,

            OrderDetails = new List<OrderDetail>(){

                new OrderDetail{

                    ItemNum = "1",

                    ItemDescr = "My Item Test 1",

                    Quantity = 100,

                    Price = 10.99M

                },

                new OrderDetail{

                    ItemNum = "2",

                    ItemDescr = "My Item Test 2",

                    Quantity = 15,

                    Price = 125.50M

                }

            }

        },

        new Order {

            Num = "2",

            CustomerNum = "CUSTTWO",

            OrderDate = DateTime.Now,

            OrderDetails = new List<OrderDetail>(){

                new OrderDetail{

                    ItemNum = "100",

                    ItemDescr = "DESCR 100",

                    Quantity = 15,

                    Price = 0.99M

                },

                new OrderDetail{

                    ItemNum = "567",

                    ItemDescr = "This is my item",

                    Quantity = 76,

                    Price = 15.50M

                }

            }

        },

        new Order {

            Num = "3",

            CustomerNum = "THIRD",

            OrderDate = DateTime.Now,

            OrderDetails = new List<OrderDetail>(){

                new OrderDetail{

                    ItemNum = "ABC",

                    ItemDescr = "ABCs",

                    Quantity = 1,

                    Price = 10.50M

                }

            }

        }

    };

    public static void Main()

    {

        Console.Write("Enter Order Number: ");

        var orderNumber = Console.ReadLine();

        try

        {

            var myOrder = GetOrder(orderNumber);

​

            if (myOrder == null)

            {

                Console.WriteLine("Order not found for Order Number '" + orderNumber + "'.");

            }

            else

            {

                PrintOrder(myOrder);

            }

        }

        catch(Exception ex) 

        {

            Console.WriteLine("And Exception Occurred:");

            Console.WriteLine(ex.Message);

            Console.WriteLine(ex.StackTrace);

        }

    }

    public static Order GetOrder(string orderNumber){

        return Orders.FirstOrDefault(x => x.Num == orderNumber);

    }

    public static void PrintOrder(Order myOrder)

    {

        Console.WriteLine("Order Number: " + myOrder.Num.ToString());

        Console.WriteLine("Customer Number: " + myOrder.CustomerNum.ToString());

        Console.WriteLine("Order Date: " + myOrder.OrderDate.ToString());

        Console.WriteLine("Order Line Items: " + myOrder.OrderDetails.Count.ToString());

        foreach(var lineItem in myOrder.OrderDetails)

        {

            Console.WriteLine("\tItem Number: " + lineItem.ItemNum);

            Console.WriteLine("\tDescription: " + lineItem.ItemDescr);

            Console.WriteLine("\tQuantity: " + lineItem.Quantity);

            Console.WriteLine("\tPrice: " + lineItem.Price);

            Console.WriteLine();

        }

    }

}

​

public class Order {

    public string Num { get; set; }

    public string CustomerNum { get; set; }

    public DateTime OrderDate { get; set; }

    public IList<OrderDetail> OrderDetails { get; set; }

}

​

​

public class OrderDetail {

    public string ItemNum { get; set; }

    public string ItemDescr { get; set; }

    public int Quantity { get; set; }

    public decimal Price { get; set; }

}

​

​