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// Car event sink.

public class CarEventSink : IEngineNotification

{

private string name;

public CarEventSink(){}

public CarEventSink(string sinkName)

{ name = sinkName; }

public void AboutToBlow(string msg)

{

Console.WriteLine("{0} reporting: {1}", name, msg);

}

public void Exploded(string msg)

{

Console.WriteLine("{0} reporting: {1}", name, msg);

}

}

Now that you have a sink object that implements the callback interface, your next task is to

pass a reference to this sink into the Car type. The Car holds onto the reference and makes calls back

on the sink when appropriate. In order to allow the Car to obtain a reference to the sink, we will

need to add a public helper member to the Car type that we will call Advise(). Likewise, if the caller

wishes to detach from the event source, it may call another helper method on the Car type named

Unadvise(). Finally, in order to allow the caller to register multiple event sinks (for the purposes of

multicasting), the Car now maintains an ArrayList to represent each outstanding connection.