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Publisher's Note: Microsoft will stop supporting .NET 5 in early May 2022. A new edition of this book is available that uses .NET 6 (an LTS release with support up until November 2024), C# 10, and Visual Studio 2022, as well as Visual Studio Code.Key Features* Explore the newest additions to C# 9, the .NET 5 class library, Entity Framework Core and Blazor* Strengthen your command of ASP.NET Core 5.0 and create professional websites and services* Build cross-platform apps for Windows, macOS, Linux, iOS, and AndroidBook DescriptionIn C# 9 and .NET 5 - Modern Cross-Platform Development, Fifth Edition, expert teacher Mark J. Price gives you everything you need to start programming C# applications.This latest edition uses the popular Visual Studio Code editor to work across all major operating systems. It is fully updated and expanded with a new chapter on the Microsoft Blazor framework.The book's first part teaches the fundamentals of C#, including object-oriented programming and new C# 9 features such as top-level programs, target-typed new object instantiation, and immutable types using the record keyword. Part 2 covers the .NET APIs, for performing tasks like managing and querying data, monitoring and improving performance, and working with the file system, async streams, serialization, and encryption. Part 3 provides examples of cross-platform apps you can build and deploy, such as websites and services using ASP.NET Core or mobile apps using Xamarin.Forms. The best type of application for learning the C# language constructs and many of the .NET libraries is one that does not distract with unnecessary application code. For that reason, the C# and .NET topics covered in Chapters 1 to 13 feature console applications. In Chapters 14 to 20, having mastered the basics of the language and libraries, you will build practical applications using ASP.NET Core, Model-View-Controller (MVC), and Blazor.By the end of the book, you will have acquired the understanding and skills you need to use C# 9 and .NET 5 to create websites, services, and mobile apps.What you will learn* Build your own types with object-oriented programming* Query and manipulate data using LINQ* Build websites and services using ASP.NET Core 5* Create intelligent apps using machine learning* Use Entity Framework Core and work with relational databases* Discover Windows app development using the Universal Windows Platform and XAML* Build rich web experiences using the Blazor framework* Build mobile applications for iOS and Android using Xamarin.FormsWho this book is forThis book is best for C# and .NET beginners, or programmers who have worked with C# in the past but feel left behind by the changes in the past few years. This book doesn't expect you to have any C# or .NET experience; however, you should have a general understanding of programming.Students and professionals with a science, technology, engineering, or mathematics (STEM) background can certainly benefit from this book.