This book does assume some familiarity with OOP and C#. Though this book covers advanced topics, it is not designed to be a comprehensive development guide. Instead, the goal of the book is to advance the skill levels of developers and designers by providing a wide array of patterns, practices, and principles. Using a toolbox analogy, the book provides a large number of tools for the modern application developer by progressing from low-level code design to higher-level architecture, as well as important patterns and principles commonly used today.

This book brought the following main points that are additions to readers knowledge:

• To know more about SOLID Principles, best practices with the help of coding examples using C#7.x and .NET Core 2.2.
• In-depth understanding of classic design pattern (Gang of four patterns).
• Functional programming principle and its working examples using C# language.
• Real world examples of Architectural patterns (MVC, MVVM).
• Understanding of native cloud, microservices and more.

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packt.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packt.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Hands-On-Design-Patterns-with-C-and-.NET-Core. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Click on the following link to see the Code in Action: http://bit.ly/2KUuNgQ.

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://static.packt-cdn.com/downloads/9781789133646_ColorImages.pdf.

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The three CounterA(), CounterB(), and CounterC() methods represent an individual ticket collection counter."

A block of code is set as follows:

3-counters are serving...
Next person from row
Person A is collecting ticket from Counter A
Person B is collecting ticket from Counter B
Person C is collecting ticket from Counter C

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

public bool UpdateQuantity(string name, int quantity)
{
    lock (_lock)
    {
        _books[name].Quantity += quantity;
    }

    return true;
}

Any command-line input or output is written as follows:

dotnet new sln

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "From Create New Product, you can add a new product, and Edit will give you the facility to update an existing product."