using System;

namespace MyCompiler
{
    public class MyCustomOptions
    {
        public string Buffer;
    }

    public class MyCustom
    {
        public event EventHandler<MyCustomOptions> OnMessage;

        public bool Message(string buffer)
        {
            if (OnMessage == null)
            {
                return false;
            }

            var options = new MyCustomOptions
            {
                Buffer = buffer
            };

            OnMessage(this, options);
            return true;
        }
    }

    public static class Program
    {
        public static void DisplayMessage(object sender, MyCustomOptions options)
        {
            Console.WriteLine(options.Buffer);
        }

        public static void Main(string[] args)
        {
            var custom = new MyCustom();

            custom.OnMessage += DisplayMessage;

            /*
            
            custom.OnMessage += delegate(object sender, MyCustomOptions options)
            {
                Console.WriteLine(options.Buffer);
            };

            */

            /*

            var custom = new MyCustom()
            {
                OnMessage += DisplayMessage
            };

            */

            Console.WriteLine("running...");
            Console.WriteLine(custom.Message("hello world"));
        }
    }
}