using System;

class ParentClass

{

    private int a;

    protected int b;

    public int c;

​

    public void TestFunction1()

    {

        Console.WriteLine(a);   //Allowed

        Console.WriteLine(b);   //Allowed

        Console.WriteLine(c);   //Allowed

    }

}

​

class ChildClass : ParentClass //private inheritance

{

    public void TestFunction2()

    {

        Console.WriteLine(a);   //Not allowed, because a is private.

        Console.WriteLine(b);   //Allowed, because ChildClass derived from ParentClass.

        Console.WriteLine(c);   //Allowed, anyone can access it.

    }

}

​

public class Program

{

    public static void Main()

    {

        ParentClass C1 = new ParentClass();

        Console.WriteLine(C1.a);    //Not allowed, because a is private.

        Console.WriteLine(C1.b);    //Not allowed, because Program does not derive from ParentClass.

        Console.WriteLine(C1.c);    //Allowed, anyone can access it.

    }

}