using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var disposable = new Disposable();

        Console.WriteLine("Disposing first time");

        disposable.Dispose();

        Console.WriteLine("Disposing second time");

        disposable.Dispose();

    }

}

​

public class Disposable : IDisposable {

    public void Dispose() {

    }

}