using System;

public class Program

{

    static void Send(Action<string> success, Action<Exception> failure)

    {

        if(false)

            success("success xpto");

        else

            failure(new Exception("failure xpto"));

    }

    public static void Main()

    {

        string main_message = null;

        Send((message) => 

        {

            main_message = message;

        }, (ex) =>

        {

            main_message = ex.Message;

        });

        Console.WriteLine(main_message);

    }   

}