CODE:

namespace ConsoleApplication5
{

    public delegate void mydele();

    class Program
    {
        static void Main(string[] args)
        {

            EventClass _ev = new EventClass();
            EventMethod _evm = new EventMethod();

            //デリゲート型を宣言するだけ。newしない
            mydele md;


            md = null;

            md += _evm.Out;

            md();



        }

        class EventClass{
            public event mydele eventname;

            public void OnEvent(){
                if(eventname != null){
                    eventname();
                }
            }
        }

        class EventMethod{
            public void Out(){
                Console.WriteLine("EventTest");
            }
        }
    }
}