using System;

​

public class Animal

{

    // base definitions

    private string AnimalName;

    public Animal(string name)

    {

        this.AnimalName = name;

    }

​

    public string PubName

    { // [1] notice that we need to define PubName for public access to Animal Name...

        get

        {

            return this.AnimalName;

        }

​

        set

        {

            this.AnimalName = value;

        }

    }

​

    // strictly compositional approach

    public class Pig

    {

        private Animal Animal

        {

            get;

            set;

        }

​

        public Pig(string name)

        {

            this.Animal = new Animal(name);

        }

​

        public string AnimalName

        {

            get

            {

                return this.Animal.AnimalName; // [1] However we do not need to use PubName from within the nested class. 

            //We essentially now have a friend class with the added benefit that it has the namespace Animal.Pig. Sweet!

            }

​

            set

            {

                this.Animal.AnimalName = value;

            }

        }

    }

​

    // nested class + inheritance approach

    public class AlsoPig : Animal

    {

        public AlsoPig(string name): base(name)

        {

        }

    }

}

​

public class Program

{

    public static void Main()

    {

        var animal = new Animal("Danimal");

        var pig = new Animal.Pig("Piggy");

        var alsoPig = new Animal.AlsoPig("AlsoPiggy");

        Console.WriteLine(animal.PubName);

        Console.WriteLine(pig.AnimalName);

        Console.WriteLine(alsoPig.PubName);

    }

}