The tutorial outlines the basic principles and tools of object-oriented programming, as well as application development tools in the high-level programming language Visual Basic in the Visual Studio.NET environment. The material presented in the manual is divided into topics, each of which is aimed at studying the tools object-oriented programming and their implementation, as well as the creation of complete working application projects in laboratory work on each topic. The manual is intended for students of technical schools, colleges, universities whose curricula include the disciplines “Computer Science”, “Fundamentals of Algorithmization and Programming”, “Programming methods and tools”, “Programming in a high-level language”, “Object-oriented programming”.