using System;

using System.Runtime.Serialization;

​

class foo

{

}

​

class bar : foo

{

    int x;

    int y;

    private bar() : base() {}

}

​

public class Program

{

    public static void Main()

    {

        var a = FormatterServices.GetUninitializedObject(typeof(bar));

        Console.WriteLine(a is foo);

        Console.WriteLine(a is bar);

        Console.WriteLine(a.GetType() == typeof(bar));

    }

}