namespace lab12
{
    partial class Program
    {


        static void Main(string[] args)
        {

            VideoEncoder videoEncoder = new VideoEncoder();
            videoEncoder.Encode(new Video {Title="Filmik"});
            MailService mailService = new MailService();
            mailService.Sendmail();
        }
    }
}

//Video

namespace lab12
{
    partial class Program
    {
        public class Video
        {
            public string Title { get; set; }
        }
    }
}

//VideoEncoder

using System.Threading;

namespace lab12
{
    partial class Program
    {
        public class VideoEncoder
        {
            public void Encode(Video video)
            {
                System.Console.WriteLine("Encoding Video ...");
                Thread.Sleep(3000);
                System.Console.WriteLine("Encoding finished ...");
            }
        }
    }
}

//mailservice

using System;

namespace lab12
{
    partial class Program
    {
        public class MailService
        {
            public void OnVideoEncoded(object source, EventArgs e)
            {
                Console.WriteLine("MailService: Sending an email...");
                
            }
            public void Sendmail()
            {
                Console.WriteLine("MailService: Sending an email...");
            }

        }
    }
}