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(Done1);
            _event = new CompleteHandler(Done1);
            _delegate += Done2;
            _event += Done2;

            DoWork();
        }

        private static void DoWork()
        {
            _delegate(4);
            _event(6);
        }

        private static void Done1(int number)
        {
            Console.WriteLine($"Done1 {number}");
        }
        private static void Done2(int number)
        {
            Console.WriteLine($"Done2 {number}");
        }
    }
}