static void Main(string[] args)
{
MyEvent ev = new MyEvent();
User u1 = new User {
Name = "Andriy", LastName = "Poberezhnyi"
};
User u2 = new User {
Name = "Olia", LastName = "Kulyk"
};
ev.userEvent += u1.UserInfoHandler;
ev.userEvent += u2.UserInfoHandler;
ev.OnSomethingHapping(); //
// ev.userEvent = null; // помилка, бо оголосили як event
ev.OnSomethingHapping();
}