Microsoft Certified Solutions Developer (MCSD) Certification Practice Test

If you want outside users of your class to raise an event, what should you implement?

1. A public method to raise the event

2. A public property to expose the event

3. A private method to handle the event internally

4. An interface with a specific event handler

The correct answer is: A public method to raise the event

Implementing a public method to raise the event is crucial for enabling outside users to trigger that event. This approach allows external code or users to interact with the functionality of your class by calling this method. Essentially, it acts as a gateway, providing a controlled means to invoke the event while encapsulating the event-raising logic within the class. When utilizing a public method, you can handle any necessary pre-processing or validation before the event is raised, ensuring that the event is raised under the appropriate conditions. This method typically manages the invocation of the event delegate, allowing subscribers to execute their respective event handlers when the event is fired. This is foundational for event-driven programming patterns, enabling object-oriented designs whereby components can communicate effectively through events. The alternative choices do not provide the same capability. While a public property could expose an event, it does not directly allow the raising of that event from outside the class. A private method would be inaccessible to users outside the class, which means no external triggering of the event can occur. Finally, defining an interface may facilitate the creation and organization of event handlers, but without a method to raise the event, it doesn’t concern itself with the triggering mechanism itself. Implementing a public method to raise the event ensures the intended