如何在C#中编写事件和事件处理程序？

// declare an event:
public event EventHandler MyEvent;

// raise an event:
var handler = MyEvent;
if(handler != null) handler(this,EventArgs.Empty);

// consume an event with an anon-method:
obj.MyEvent += delegate { Console.WriteLine("something happened"); };

// consume an event with a named method:
obj.MyEvent += SomeHandler;

void SomeHandler(object sender,EventArgs args) {
    Console.WriteLine("something happened");
}

什么是麻烦的？