using System;

public class Program

{

    public static void Main()

    {

        MaxDerived1Entity.TestEvent += HandleEvent;

        Console.WriteLine("Hello World");

        MaxDerived2Entity loEntity = new MaxDerived2Entity();

        loEntity.Report();

​

    }

    public static void HandleEvent(object loClass, EventArgs e)

    {

        Console.WriteLine("Handled " + loClass.GetType().ToString());

    }   

​

}

​

    public abstract class MaxEntity

    {

        protected string TestText = "base";

        public static event EventHandler TestEvent = delegate { };

        public void Report()

        {

            Console.WriteLine(this.TestText);

            EventHandler loHandler = TestEvent;

            if (loHandler != null)

            {

                loHandler(this, null);

            }

        }

    }

    public class MaxDerived1Entity : MaxEntity

    {

        public MaxDerived1Entity()

        {

            this.TestText = "1";    

        }

    }

​

    public class MaxDerived2Entity : MaxEntity

    {

        public MaxDerived2Entity()

        {

            this.TestText = "2";    

        }

    }