using System;

public class Program

{

    public static void Main()

    {

        Singleton.getSingle().SayHello();

    }

}

​

public class Singleton {

    private Singleton(){

    }

    public static Singleton s = new Singleton();

    public static Singleton getSingle(){

        return s;}

    public void SayHello() {

        Console.WriteLine("Hello");

    }

}