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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#

Let's assume we are familiar with the following exception message:

```csharp
"Object reference not set to an instance of an object"
```

That's the `NullReferenceException`. This minicourse will teach us principles and techniques to avoid this exception.

We will learn when `NullReferenceException` is thrown, how to use nullable operators and references, and how to use the `Option` type to avoid this exception. Also, we will learn how to avoid `NullReferenceException` when working with some LINQ methods.

## Prerequisites

This is not an introductory course on C#. Prior to taking this course, you should be comfortable declaring and initializing objects and working with conditionals, loops, and collections, such as arrays and lists.

All examples are run using .NET 6. If we want to apply these lessons to our everyday coding, we should install a recent version of an integrated development environment (IDE) for C#, such as Visual Studio.

Even though we're using modern C# features from .NET 6, some techniques will still work with the classic .NET Framework.

Without any further ado, let's get started!

Get introduced to the course and its prerequisites.

Strategies to Get Rid of NullReferenceException

About This Course

Overview

Prerequisites