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Krystyna Ślusarczyk

Welcome to the "LINQ Tutorial: Master the Key C# Library", the only course you need to become fluent in using library essential for every C# programmer.

No matter what application you work on or ever will work on - you will always need to manipulate collections. Whether it's ordering, filtering, or transforming collections, or anything else - LINQ is the tool for the job. As a core part of .NET, it's a library that every C# programmer must know. LINQ provides the ability to not only query the collections stored in application memory, but also remote data sources, like databases or XML files.

Read more

Welcome to the "LINQ Tutorial: Master the Key C# Library", the only course you need to become fluent in using library essential for every C# programmer.

No matter what application you work on or ever will work on - you will always need to manipulate collections. Whether it's ordering, filtering, or transforming collections, or anything else - LINQ is the tool for the job. As a core part of .NET, it's a library that every C# programmer must know. LINQ provides the ability to not only query the collections stored in application memory, but also remote data sources, like databases or XML files.

Check out the free video about one of the most commonly used methods from LINQ - the Where method.

This course is practice-oriented. After each lecture, you will solve two coding exercises and one refactoring challenge, where you will transform an awkward code into an elegant, short, and clean code using LINQ. Even if you won't be able to solve the exercise right off the bat, don't worry - an article with a detailed explanation of the solution is provided for each exercise.

This course is for everyone with basic knowledge of C#. Every topic will be explained in detail. In the introduction section, you will learn all you need to continue, like what lambda expressions are or what IEnumerable is.

If you already know some LINQ, this course will help you start using it like a pro, as well as understand how it works under the hood.

By solving 64 coding exercises and 32 refactoring challenges, you will gain practical knowledge of LINQ and become a better programmer. You will start "thinking in LINQ" and using this amazing library will become a natural thing to you.

Don't forget that LINQ knowledge is expected by basically every employer, and it's extremely often verified during interviews. After taking this course, you will gain confidence in discussing the topic of LINQ.

LINQ has two ways of writing queries - the method syntax and the query syntax. We will learn both of them.

You'll be able to access all examples from videos, as well as all coding exercises and refactoring challenges, including solutions, in the Git repository included in this course.

This course comes with a 30-day money-back guarantee. If you are not satisfied, you can return it and get all your money back, no questions asked. In other words, you don't risk anything by purchasing this course. You have nothing to lose, and the knowledge you will gain may take your career to the next level.

So, why hesitate? Join me in this course and start using LINQ like a pro.

Enroll now

What's inside

Syllabus

Welcome!
Welcome! (Basic information and how to get help)
Installing Visual Studio Community
Accessing the code - link to the repository
Read more
Accessing the code and what's what in the solution
Introduction to LINQ
What is LINQ?
What are lambda expressions?
LINQ and extension methods
LINQ, IEnumerable and the method chaining
Deferred execution in LINQ
Method syntax vs query syntax
Any
Any - coding exercise 1
Any - coding exercise 1 - solution
Any - coding exercise 2
Any - coding exercise 2 - solution
Any - refactoring challenge
Any - refactoring challenge - solution
All
Average - coding exercise 1 - solution
All - coding exercise 1
All - coding exercise 1 - solution
All - coding exercise 2
All - coding exercise 2 - solution
All - refactoring challenge
All - refactoring challenge - solution
Count
Count - coding exercise 1
Count - coding exercise 1 - solution
Count - coding exercise 2
Count - coding exercise 2 - solution
Count - refactoring challange
Count - refactoring challange - solution
Contains
Average - coding exercise 2
Contains - coding exercise 1
Contains - coding exercise 1 - solution
Contains - coding exercise 2
Contains - coding exercise 2 - solution
Contains - refactoring challenge
Contains - refactoring challenge - solution
OrderBy
OrderBy - coding exercise 1
OrderBy - coding exercise 1 - solution
OrderBy - coding exercise 2
OrderBy - coding exercise 2 - solution
OrderBy - refactoring challenge
OrderBy - refactoring challenge - solution
MinMax
Average - coding exercise 2 - solution
MinMax - coding exercise 1
MinMax - coding exercise 1 - solution
MinMax - coding exercise 2
MinMax - coding exercise 2 - solution
MinMax - refactoring challenge
MinMax - refactoring challenge - solution
Average
Average - coding exercise 1
Average - refactoring challenge
Average - refactoring challenge - solution
In this section you will learn how to use the Sum method from LINQ.
Sum
Sum - coding exercise 1
Sum - coding exercise 1 - solution
Sum - coding exercise 2
Sum - coding exercise 2 - solution
Sum - refactoring challenge
Sum - refactoring challenge - solution
In this section you will learn how to use LINQ methods ElementAt and ElementAtOrDefault.
ElementAt
ElementAt - coding exercise 1
ElementAt - coding exercise 1 - solution
ElementAt - coding exercise 2
ElementAt - coding exercise 2 - solution
ElementAt - refactoring challenge
ElementAt - refactoring challenge - solution
In this section you will learn how to use LINQ methods First, FirstOrDefault, Last and LastOrDefault.
First and Last
First and Last - coding exercise 1
First and Last - coding exercise 1 - solution
First and Last - coding exercise 2
First and Last - coding exercise 2 - solution
First and Last - refactoring challenge
First and Last - refactoring challenge - solution
In this section you will learn how to use LINQ methods Single and SingleOrDefault.
Single
Single - coding exercise 1
Single - coding exercise 1 - solution
Single - coding exercise 2
Single - coding exercise 2 - solution
Single - refactoring challenge
Single - refactoring challenge - solution

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Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in LINQ Tutorial: Master the Key C# Library with these activities:
Review C# Fundamentals
Reinforce your understanding of C# fundamentals, including data types, control flow, and object-oriented programming concepts, to better grasp LINQ's capabilities.
Show steps
  • Review C# documentation and tutorials.
  • Practice writing basic C# programs.
  • Complete online C# quizzes and exercises.
C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development
Expand your understanding of LINQ within the broader context of C# and .NET Core by reading a comprehensive book on modern C# development.
Show steps
  • Read the chapters related to LINQ and data manipulation.
  • Experiment with the code examples provided in the book.
  • Relate the concepts to the course material.
Implement LINQ Methods from Scratch
Deepen your understanding of LINQ by implementing common LINQ methods like Where, Select, and OrderBy from scratch, without using the built-in LINQ library.
Show steps
  • Choose a set of LINQ methods to implement.
  • Write C# code to mimic the behavior of each method.
  • Test your implementations thoroughly with various data sets.
Four other activities
Expand to see all activities and additional details
Show all seven activities
Create a LINQ Cheat Sheet
Solidify your knowledge of LINQ syntax and methods by creating a cheat sheet that summarizes the most commonly used LINQ operators and their usage.
Show steps
  • Identify the key LINQ operators and methods.
  • Write concise explanations and examples for each operator.
  • Organize the cheat sheet for easy reference.
  • Share your cheat sheet with other learners.
Build a Data Transformation Pipeline with LINQ
Apply your LINQ skills by building a data transformation pipeline that reads data from a source (e.g., a CSV file or database), transforms it using LINQ queries, and writes the transformed data to a destination.
Show steps
  • Select a data source and destination.
  • Design the data transformation steps using LINQ.
  • Implement the pipeline in C#.
  • Test the pipeline with different data sets.
CLR via C#
Gain a deeper understanding of the CLR and how LINQ works under the hood by reading a book that explores the inner workings of the .NET runtime.
Show steps
  • Read the sections related to memory management and execution.
  • Understand how LINQ queries are translated and executed.
  • Relate the concepts to performance considerations.
Contribute to a LINQ-Related Open Source Project
Enhance your LINQ skills and contribute to the open-source community by finding and contributing to a project that utilizes or extends LINQ functionality.
Show steps
  • Search for LINQ-related open-source projects on GitHub.
  • Identify a project that aligns with your interests and skill level.
  • Contribute by fixing bugs, adding new features, or improving documentation.

Career center

Learners who complete LINQ Tutorial: Master the Key C# Library will develop knowledge and skills that may be useful to these careers:
C# Developer
As a C# Developer, you will be immersed in the world of .NET, where LINQ is a fundamental tool for data manipulation. This course specifically focuses on mastering LINQ, a core component of .NET, providing you with essential skills for querying collections stored in application memory or remote data sources like databases. The course's emphasis on practical exercises, including coding and refactoring, allows you to internalize LINQ concepts and apply them effectively in your projects. You'll also learn both the method and query syntaxes, broadening your versatility as a C# Developer.
Backend Developer
Backend Developers construct the server-side logic that powers applications, making efficient data handling crucial. This LINQ course is directly relevant, as LINQ provides a powerful way to query and manipulate data collections within C# which is a common tool in backend operations. Through coding exercises and refactoring challenges, you will learn to apply LINQ's functionality to optimize data access and processing. This knowledge helps to improve performance and streamline data retrieval processes within applications. Moreover, this course covers both the method and query syntaxes.
Software Engineer
Software Engineers are involved in all stages of the software development lifecycle, and often need to work with collections of data. Completing this LINQ course can give you a practical understanding of data manipulation within the C# ecosystem. You will learn how to use LINQ to query, filter, and transform data efficiently. Furthermore, the focus on both method and query syntaxes within this course will give you the ability to improve your proficiency in C#. The coding and refactoring exercises provided will improve your ability to problem-solve.
Application Developer
An Application Developer builds and maintains software applications, frequently interacting with data collections. This LINQ course will provide you with a solid understanding of how to efficiently work with these collections within the C# environment. The course covers essential LINQ functionalities, such as ordering, filtering, and transforming data. By working through coding exercises and refactoring challenges, you will learn to leverage LINQ to improve the performance and maintainability of your applications. You'll also be able to confidently use and discuss LINQ, a skill highly valued by employers.
Software Developer
A Software Developer designs, develops, and tests software applications. This often involves manipulating collections of data, making the knowledge of LINQ highly valuable. This course on LINQ, a key C# library, will equip you with the skills to efficiently query, filter, and transform data collections within your applications. The practice-oriented approach, featuring coding exercises and refactoring challenges, will help you master LINQ's method and query syntaxes, enabling you to write cleaner and more effective code. You'll also gain confidence in discussing LINQ during technical interviews.
Full-Stack Developer
A Full Stack Developer works on both the front-end and back-end of applications, often requiring the manipulation of data from various sources. This LINQ tutorial can be particularly valuable for the back-end development aspect, where C# is frequently used. You will learn to effectively query and transform data using LINQ, a library essential for any C# programmer. By mastering LINQ's method and query syntaxes through hands-on exercises, you can optimize data access and manipulation within your applications. You'll also gain practical experience that can be showcased during technical interviews.
Technical Lead
Technical Leads guide development teams and make key technical decisions. Direct coding may happen less, but a strong understanding of core technologies is essential to lead teams that use them. This course on LINQ can be highly beneficial for Technical Leads working with C#. This course provides a deeper understanding of data manipulation techniques within C# applications. Because the course focuses on practical exercises, it will help you to understand the possibilities and limits of LINQ so you can make effective decisions about its application within your projects. You will also better understand method and query syntaxes.
Data Engineer
Data Engineers design, build, and maintain data pipelines and infrastructure. While Data Engineers often work with large datasets and specialized tools, a grasp of LINQ can be helpful when integrating C# applications into data workflows. This course will help you learn to query and manipulate data collections within C# applications, using LINQ. The practice-oriented approach, with its coding exercises and refactoring challenges, will help solidify your understanding of LINQ. You will also learn how to apply LINQ's method and query syntaxes. This can prove useful when interfacing with systems reliant on the .NET framework.
Test Automation Engineer
Test Automation Engineers develop automated tests to ensure software quality. Often, this involves manipulating and validating data within the application. This LINQ tutorial can be particularly useful, as it teaches you how to efficiently query and work with data collections using LINQ within C#. The practical exercises, including coding and refactoring challenges, reinforce your understanding of LINQ concepts. You'll also learn how to validate software. You will also use your knowledge of method and query syntaxes.
Solutions Architect
Solutions Architects design and oversee the implementation of technical solutions, often requiring a deep understanding of various technologies and their interactions. While this role is less directly involved in coding, understanding LINQ can be beneficial when designing systems that involve C# components. This LINQ course can provide valuable insight into how data can be efficiently queried and manipulated within C# applications. Understanding LINQ influences decisions about data access strategies and optimization techniques. Also, because this course covers method and query syntaxes, you will be able to guide your team with informed suggestions.
Data Analyst
Data Analysts examine and interpret data to provide insights and inform decision-making. While a Data Analyst typically uses specialized tools like SQL or Python, some analysis may involve extracting and manipulating data within C# applications. This LINQ course will help you use C# and LINQ to efficiently query, filter, and transform data collections. The hands-on exercises and refactoring challenges offer practical experience in data manipulation within the .NET environment. It will also expose you to method and query syntaxes, which are helpful to know.
Database Developer
A Database Developer designs and implements databases and data access layers. Though database developers primarily use SQL, understanding how C# applications interact with data is invaluable. This LINQ tutorial can help developers who are also familiar with C# to work seamlessly with .NET applications. The course helps one to use LINQ to query data from the database. The course's use of coding exercises and refactoring challenges helps you master LINQ's syntax. You will also learn method and query syntax.
System Architect
System Architects design the overall structure of IT systems, dictating how different components interact. While less involved in day-to-day coding, they need a broad understanding of available technologies. This LINQ course can be valuable when architecting systems that include C# applications. Architects may also be responsible for querying data with LINQ. The coding exercises and refactoring challenges ensure you internalize LINQ concepts. System architects will find the section on method syntax and query syntax particularly useful.
Software Consultant
Software Consultants provide expert advice and guidance to clients on software development projects. The course material may be helpful to software consultants. In particular, Software Consultants familiar with C# may advise a client to integrate the C# library LINQ into the project. By taking the course and seeing the coding exercises and refactoring challenges, Software Consultants can better understand whether to advise this or not. The sections on method syntax and query syntax will also be helpful.
Technical Trainer
Technical Trainers teach others how to use software and technologies. If your company uses C#, you may be asked to provide internal workshops where LINQ is covered. This course can help prepare you for the role. You can work through the coding exercises and refactoring challenges to deepen your understanding of the material. You can also present the material on method syntax and query syntax in your workshops.

Reading list

We've selected two books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in LINQ Tutorial: Master the Key C# Library.
Provides a comprehensive guide to C# 8.0 and .NET Core 3.0, covering the latest features and best practices for cross-platform development. It includes detailed explanations of LINQ and its integration with other .NET Core features. This book is useful for understanding the broader context of LINQ within the .NET ecosystem. It is commonly used as a reference by industry professionals.
Delves into the inner workings of the Common Language Runtime (CLR), providing a deep understanding of how C# code is executed. While not solely focused on LINQ, it offers valuable insights into the underlying mechanisms that enable LINQ's functionality. This book is more valuable as additional reading than as a current reference. It is commonly used by advanced developers seeking a deeper understanding of the .NET platform.

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