using System;
 
namespace ConsoleApp1
{
    class Program
    {
        public delegate void CompleteHandler(int number);
        public static CompleteHandler _delegate;
        public static event CompleteHandler _event;
 
        static void Main(string[] args)
        {
            _delegate = new CompleteHandler(Done);
            _event = new CompleteHandler(Done);
            _event += Done;
 
            DoWork();
        }
 
        private static void DoWork()
        {
            _delegate(4);
            _event(6);
        }
 
        private static void Done(int number)
        {
            Console.WriteLine($"complete {number}");
        }
    }
}
 

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