using System;

public class Program

{

    public static void Main()

    {

        AccountManager accountManager = new AccountManager();

        accountManager.CheckIfLoggedIn((o,e) => { Console.WriteLine("event fired");  });

        Console.WriteLine("Hello World");

    }

}

​

public class AccountManager 

{

​

    public delegate void CheckIfLoggedInListener(EventArgs e);

    public event EventHandler<EventArgs> SetCheckIfLoggedInListener;

​

    public void CheckIfLoggedIn(Action<object,EventArgs> action)

    {

        SetCheckIfLoggedInListener = action.Invoke;

         if(SetCheckIfLoggedInListener!=null)

             SetCheckIfLoggedInListener(null,new EventArgs());

    }

}