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#

We’ve learned how to use the `Where` method. It returns a new collection with the elements that meet a condition. But what happens to the input collection when we filter it using the `Where` method? Let's find out!

# Does LINQ change input collections?

Let's go back to the [previous exercises](https://www.educative.io/courses/getting-started-linq-c-sharp/exercise-find-your-favorite-movies) and print the input collection before and after filtering it with the `Where` method. This will show us if LINQ changes input collections.


In the below example, use the `PrintMovies` method to print the `movies` collection before and after filtering it each time. More movies have been added, as well as a LINQ query to find movies released in 2001.

Notice in the printed messages if the list of movies has the same elements. Are they in the same order?

Learn what happens to input collections when working with LINQ.

Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

LINQ and Immutability