Practicing and exploring

Test your knowledge and understanding by answering some questions. Get some hands-on practice and explore with deeper research into this chapter's topics.

Exercise 6.1 – Test your knowledge

Answer the following questions:

1. What is a delegate?
2. What is an event?
3. How are a base class and a derived class related?
4. What is the difference between is and as?
5. Which keyword is used to prevent a class from being derived from, or a method from being overridden?
6. Which keyword is used to prevent a class from being instantiated with the new keyword?
7. Which keyword is used to allow a member to be overridden?
8. What's the difference between a destructor and a deconstructor?
9. What are the signatures of the constructors that all exceptions should have?
10. What is an extension method and how do you define one?

Exercise 6.2 – Practice creating an inheritance hierarchy

Add a new console application named Exercise02.

Create a class named Shape with properties named Height, Width, and Area.

Add three classes that...