using System;

public class Program

{

    public static void Main()

    {

        var someSubclass = new SomeSubclassActiveState();

        var someSubclassActiveState = someSubclass as IActiveState;

        Console.WriteLine(someSubclass.BaseActive());

        Console.WriteLine(someSubclass.Active);

        Console.WriteLine(someSubclassActiveState.Active);

    }

    class BaseActiveState : IActiveState

    {

        public bool Active => true;

    }

    class SubclassActiveState : BaseActiveState

    {

        public new bool Active => false;

    }

    class SomeClass

    {

        public bool Active => true;

    }

    class SomeSubclassActiveState : SomeClass, IActiveState

    {

        public new bool Active => false;

        public bool BaseActive()

        {

            return base.Active;

        }

    }

    interface IActiveState{

      bool Active {get;}    

    }

}