using System;

#nullable enable

​

public class Program

{

    public static event EventHandler? AnEvent;

    public static Action? AnAction;

    static void Main(string[] args)

    { 

        AnEvent += FooEvent;

        AnEvent += BarEvent;

        AnAction += Foo;

        AnAction += Bar;

        AnEvent(null, null!);

        AnAction();

    }

    private static void FooEvent(object? sender, EventArgs args)

    {

        Console.WriteLine("Event Foo");

    }

    private static void BarEvent(object? sender, EventArgs args)

    {

        Console.WriteLine("Event Bar");

    }

    private static void Foo()

    {

        Console.WriteLine("Foo");

    }

    private static void Bar()

    {

        Console.WriteLine("Bar");

    }

}