using System;

​

public class BirthdayEventArgs : EventArgs

{

    public string Message { get; private set; }

    public BirthdayEventArgs(string message) { Message = message; }

}

​

public class Person

{

    public event EventHandler<BirthdayEventArgs> HappyBirthday;

    public int Age { get; set; }

    public string Name { get; set; }

    public void ItsMyBirthday()

    {

        if (HappyBirthday != null)

            HappyBirthday(this,

                          new BirthdayEventArgs(

                              string.Format("{0} birthday is today and is {1} years old!",

                                            Name, Age)));

    }

}

​

public static class Program

{

    public static void Main()

    {

        //Create the person

        Person p = new Person() { Name = "Joe Smith", Age = 142 };

        p.HappyBirthday += HappyBirthday;  //Subscribe to the event

        p.ItsMyBirthday(); //Raises the event

        //These lines are commented out of the Fiddle because the cause a wait condition

        //Console.WriteLine("Press any key to quit");

        //Console.ReadKey(true);

    }

    static void HappyBirthday(object sender, BirthdayEventArgs e)

    {

        //sender is the Person, and it has event arguments

        Console.WriteLine(e.Message);

    }

}