using System;

using System.Linq;

using System.Collections.Generic;

using System.Threading;

using System.Threading.Tasks;

​

class WrongSingleInstantiation {

    public static WrongSingleInstantiation Instance => new();

    private WrongSingleInstantiation() {

        Console.WriteLine("Creating a new WrongSingleInstantiation ☹");

    }

}

​

class CorrectSingleInstantiation {

    public static CorrectSingleInstantiation Instance { get; } = new();

    private CorrectSingleInstantiation() {

        Console.WriteLine("Creating a new CorrectSingleInstantiation 🎉");

    }

}

class Example

{

​

    static async Task Main(string[] args)

    {

        for(var i = 0; i < 100; i++) {

            var foo = WrongSingleInstantiation.Instance;

            var bar = CorrectSingleInstantiation.Instance;

        }

    }

}