C# EventArgs

from msdn: http://msdn.microsoft.com/en-us/library/system.eventargs(v=vs.71).aspx

using System;

// FireEventArgs: a custom event inherited from EventArgs.

public class FireEventArgs: EventArgs {
    public FireEventArgs(string room, int ferocity) {
        this.room = room;
        this.ferocity = ferocity;
    }

    // The fire event will have two pieces of information-- 
    // 1) Where the fire is, and 2) how "ferocious" it is.  

    public string room;
    public int ferocity;

}    //end of class FireEventArgs


// Class with a function that creates the eventargs and initiates the event
public class FireAlarm {

    // Events are handled with delegates, so we must establish a FireEventHandler
    // as a delegate:

    public delegate void FireEventHandler(object sender, FireEventArgs fe);

    // Now, create a public event "FireEvent" whose type is our FireEventHandler delegate. 

    public event FireEventHandler FireEvent;    

    // This will be the starting point of our event-- it will create FireEventArgs,
    // and then raise the event, passing FireEventArgs. 

    public void ActivateFireAlarm(string room, int ferocity) {

        FireEventArgs fireArgs = new FireEventArgs(room, ferocity);

        // Now, raise the event by invoking the delegate. Pass in 
        // the object that initated the event (this) as well as FireEventArgs. 
        // The call must match the signature of FireEventHandler.

        FireEvent(this, fireArgs); 
    }
}    // end of class FireAlarm


// Class which handles the event

class FireHandlerClass {

    // Create a FireAlarm to handle and raise the fire events. 

    public FireHandlerClass(FireAlarm fireAlarm)    {

        // Add a delegate containing the ExtinguishFire function to the class'
        // event so that when FireAlarm is raised, it will subsequently execute 
        // ExtinguishFire.

        fireAlarm.FireEvent += new FireAlarm.FireEventHandler(ExtinguishFire);
    }

    // This is the function to be executed when a fire event is raised. 
 
    void ExtinguishFire(object sender, FireEventArgs fe) {

        Console.WriteLine("\nThe ExtinguishFire function was called by {0}.", sender.ToString());

        // Now, act in response to the event.

        if (fe.ferocity < 2)
            Console.WriteLine("This fire in the {0} is no problem.  I'm going to pour some water on it.", fe.room);
        else if (fe.ferocity < 5)
            Console.WriteLine("I'm using FireExtinguisher to put out the fire in the {0}.",  fe.room);
        else 
            Console.WriteLine("The fire in the {0} is out of control.  I'm calling the fire department!", fe.room);
    }
}    //end of class FireHandlerClass

public class FireEventTest {
    public static void Main ()     {    

        // Create an instance of the class that will be firing an event.

        FireAlarm myFireAlarm = new FireAlarm();
        
        // Create an instance of the class that will be handling the event. Note that 
        // it receives the class that will fire the event as a parameter. 

        FireHandlerClass myFireHandler = new FireHandlerClass(myFireAlarm);
        
        //use our class to raise a few events and watch them get handled
        myFireAlarm.ActivateFireAlarm("Kitchen", 3);
        myFireAlarm.ActivateFireAlarm("Study", 1);
        myFireAlarm.ActivateFireAlarm("Porch", 5);
        
        return;

    }    //end of main

}    // end of FireEventTest