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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#

So far, we've learned that we get a `NullReferenceException` when we call a method or property on an uninitialized object reference, either by returning `null` from a method or by passing it as a parameter. But we can also find this exception when working with collections, such as arrays and lists.

Now, let's play with arrays and lists to get a `NullReferenceException`.

Play around with arrays and lists to get a NullReferenceException.

Exercise: NullReferenceException and Collections