using System;

using System.Collections.Generic;

using System.Linq;

public class Order

{

    public string Name { get; set; }    

    public int Number { get; set; }

    public IList<LineItem> Items { get; set; }

    public override string ToString()

    {

        return string.Format("Name: {0}, Number: {1}, Line Items: [{2}]", Name, Number, string.Join("|", Items.Select(i => string.Format("Name: {0}, Qty: {1}, Price: {2}", i.Name, i.Quantity, i.Price))));

    }

}

​

public class LineItem

{

    public string Name { get; set; }    

    public int Quantity { get; set; }

    public decimal Price { get; set; }

}

​

public class Program

{   

    public static void Main()

    {

        var order = new Order

        {

            Name = "OrderName",

            Number = 123,

            Items = new LineItem[]

            {

                new LineItem { Name = "Item 1", Quantity = 10, Price = 12.34m },

                new LineItem { Name = "Item 2", Quantity = 20, Price = 56.78m }

            }

        };

        Console.WriteLine(order);

    }

}