public static void PubSubPattern()
{
// step3: Create Publisher instance
var trainSignal = new TrainSignal();
//step4: add subscribers
new Car(trainSignal);
new Car(trainSignal);
new Car(trainSignal);
// step5: publish events to subscribers
trainSignal.HereComesAtrain();
}
public Car(TrainSignal trainSignal)
{
//register events or create invokation list
trainSignal.TrainIsComing += StopCar;
}