internal class Program
    {
        private static void Main()
        {
            new Example().Do();

            Console.Read();
        }
    }

    internal class Example
    {
        public delegate void MyDelegate();

        public void Do()
        {
            Console.WriteLine("Do begins");
            MyDelegate dl = Foo;
            Console.WriteLine("Do after dl = Foo");
            dl.BeginInvoke(Completed, dl);
            Console.WriteLine("Do after dl.BeginInvoke");
            Console.WriteLine("Do ends");
        }

        public void Completed(IAsyncResult ar)
        {
            Console.WriteLine("Completed begins");
            MyDelegate dl = (MyDelegate)ar.AsyncState;
            Console.WriteLine("Completed after dl = AsyncState");
            dl.EndInvoke(ar);
            Console.WriteLine("Completed after dl.EndInvoke");
        }

        private void Foo()
        {
            Console.WriteLine("Doing Foo stuff");
        }
    }