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NullReferenceException is an error that programmers frequently encounter, and it is often referred to as the Billion Dollar Mistake. This course is designed to assist you in avoiding this error.

You will begin by gaining an understanding of when NullReferenceException is thrown and how to prevent null in your code. You’ll also learn how to employ nullable operators to simplify null checks and use nullable references and the Option wrapper to identify problematic code blocks. Finally, you will explore avoiding NullReferenceException when using specific LINQ methods and designing your C# classes.

Upon completing this course, you’ll have gained the necessary knowledge and skills to effectively address and avoid NullReferenceException issues in your projects.

Mastering NullReferenceException Prevention in C#

# Use the `Option` type

Now, it's your turn!

Let's practice using the `Option` type and some of its methods. For this exercise, fill in the `PrintReport()` method to show all the TV shows we have in our catalog. This time, instead of a `Movie` class, we have a `TvShow` class. Each TV show has a name, rating, creator, and start and end dates. And each creator has a name and a last award name.

Before jumping into the exercise, let's cover three utility methods from the `Optional` library: `Match()`, `MatchSome()`, and `MatchNone()`. These three methods might be handy when solving the exercise.

With the `Match()` method, we can evaluate a function on either value of the `Option`. And with `MatchSome()` and `MatchNone()`, we can run a side effect with the `Option` having a value and with it not having one, respectively.

For example:

Use the Option type and some of its methods.

Exercise: Practicing Utility Methods from the Optional Library

Use the Option type

Use the `Option` type