using System;

​

public class A

{

    public class Settings

    {

        public int x = 0;

    }

    public Settings mySettings = new Settings();

}

​

public class B : A

{

    public new class Settings : A.Settings  

    {

        public int y = 5;

    }

    public new Settings mySettings = new Settings();

}

public class Program

{

    public static void Main()

    {

        A testA = new A();

        B testB = new B();

        Console.WriteLine(testA.mySettings.x);

        Console.WriteLine(testB.mySettings.x);

        //Console.WriteLine(testA.mySettings.y);

        Console.WriteLine(testB.mySettings.y);

    }

}