Chaining events.

   
 


using System;

public class EventTestClass {
    private int nValue;
    public delegate void ValueChangedEventHandler();
    public event ValueChangedEventHandler Changed;
    protected virtual void OnChanged() {
        if (Changed != null)
            Changed();
        else
            Console.WriteLine("Event fired. No handler!");
    }

    public EventTestClass(int nValue) {
        SetValue(nValue);
    }
    public void SetValue(int nV) {
        if (nValue != nV) {
            nValue = nV;
            OnChanged();
        }
    }
}

public class Mainclass {
    public void HandleChange1() {
        Console.WriteLine("Handler 1 Called");
    }
    public void HandleChange2() {
        Console.WriteLine("Handler 2 Called");
    }
    public Mainclass() {
    }

    public static void Main() {
        EventTestClass etc = new EventTestClass(3);
        Mainclass app = new Mainclass();

        etc.Changed += new EventTestClass.ValueChangedEventHandler(app.HandleChange1);
        etc.Changed += new EventTestClass.ValueChangedEventHandler(app.HandleChange2);

        etc.SetValue(5);
        etc.SetValue(5);
        etc.SetValue(3);
    }
}