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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 transform a collection of collections

We’ve seen the `Select` method to transform every element of a single collection. There is a similar method to work with a collection of collections, `SelectMany`.

The `SelectMany` method transforms a collection of collections into a flat collection. Other programming languages call it `Flatten` instead.

# How to transform a collection of collections

We’ve seen the `Select` method to transform every element of a single collection. There is a similar method to work with a collection of collections, `SelectMany`.

The `SelectMany` method transforms a collection of collections into a flat collection. Other programming languages call it `Flatten` instead.

Learn how to flatten a collection of collections with the SelectMany method.

Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

SelectMany Method

How to transform a collection of collections