Gain insights into LINQ in C#, learn about lambda expressions, explore common LINQ methods, avoid pitfalls, and refactor code to be more expressive and efficient.

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LINQ is the best feature in C#. If you’re interested in writing more expressive code to work with collections, this course is for you. In this course, you will learn about what LINQ is and what lambda expressions are. You will learn the most common LINQ methods and some common pitfalls to avoid when using LINQ. You will also write your first methods using LINQ and use LINQ to refactor some common constructs.

Getting Started with LINQ in C#

## How to use an alternative default value with `FirstOrDefault`

One mistake when working with `FirstOrDefault`, `LastOrDefault`, and `SingleOrDefault` is using their result without checking if the returned value is different from `null`. Remember, when working with a collection of objects, these three methods return `null` when they don't find any matching elements in the collection.

One alternative to working with `FirstOrDefault` and similar methods is to always check for `null` before using its results.

# How to use an alternative default value with `FirstOrDefault`

One mistake when working with `FirstOrDefault`, `LastOrDefault`, and `SingleOrDefault` is using their result without checking if the returned value is different from `null`. Remember, when working with a collection of objects, these three methods return `null` when they don't find any matching elements in the collection.

One alternative to working with `FirstOrDefault` and similar methods is to always check for `null` before using its results.

Learn how to use safe defaults when FirstOrDefault doesn't find any elements.

Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

XOrDefault Methods with Defaults

How to use an alternative default value with `FirstOrDefault`