using System;

​

internal class Program

{

    public static void Main(string[] args)

    {

        MySingleton mySingleton = MySingleton.Instance;

        mySingleton.DoSomething();

​

        MySingleton mySingleton2 = MySingleton.Instance;

        mySingleton2.DoSomething();

    }

}

​

public class MySingleton

{

    private static MySingleton _instance;

    private MySingleton() 

    {

    }

​

    public static MySingleton Instance

    {

        get { if (_instance == null) { _instance = new MySingleton();} return _instance;}

    }

}