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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 refactor object validation with `All`

When we need to validate an object against a set of rules, we write some `if` statements to check if the input object breaks at least one of the rules.

For example, let's check if we can watch a movie with kids. We have decided to watch films with G or PG certificates and all genres but war.

# How to refactor object validation with `All`

When we need to validate an object against a set of rules, we write some `if` statements to check if the input object breaks at least one of the rules.

For example, let's check if we can watch a movie with kids. We have decided to watch films with G or PG certificates and all genres but war.

Use the All method to validate an object.

Getting Started

LINQ Method: Where

Common LINQ Methods

Syntax & Pitfalls

Refactor with LINQ

What's New in LINQ?

Wrap-up!

Validate Objects with All

How to refactor object validation with `All`