The publication covers all topics related to development in C #. At the beginning of the book, you will learn the basics of C #, including object-oriented programming, as well as the new features of C # 8.0. Several chapters are devoted to the .NET Standard API used to query and manage data, track and improve performance, work with the file system, asynchronous threads, serialization and encryption. In addition, using examples of cross-platform applications, you can build and deploy your own. For example, web applications using ASP.NET Core or mobile applications on Xamarin Forms. You will also get acquainted with the technologies used to create Windows applications for PCs, in particular with Windows Forms, Windows Presentation Foundation (WPF) and Universal Windows Platform (UWP).