using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        bool? b = null;     

        Console.WriteLine(TestValue(b));

        b = true;

        Console.WriteLine(TestValue(b));

        b = false;

        Console.WriteLine(TestValue(b));

        object randomObject = null;

        Console.WriteLine(TestValue(randomObject));

        randomObject = new object();        

        Console.WriteLine(TestValue(randomObject));

    }

    public static string TestValue(object value)

    {

        return value is true ? "StackOrientation.Horizontal" : "StackOrientation.Vertical";

    }

}