using System;

public class Program
{
    public static void Main()
    {
        var conn = new Conn();
        var work = new Work(conn);
        conn.Raise();
    }
}

public class Conn
{
    public Conn()
    {
        UserEvent += eventWorker;
    }

    private void eventWorker()
    {
        Console.WriteLine("1");
    }

    private int age;
    private string name;

    public delegate void UI ();
    public event UI UserEvent;

    public void Raise()
    {
        if (UserEvent != null)
            UserEvent();
    }
}

public class Work
{
    private Conn _conn;
    public Work(Conn conn)
    {
        _conn = conn;
        MajorWork();
    }
    private void MajorWork()
    {
        _conn.UserEvent += eventWorker;
    }

    private void eventWorker()
    {
        Console.WriteLine("2");
    }
}