The course of lectures is devoted to modern programming languages. The study of programming languages is based on the theoretical foundation of modern approaches and mathematical formalizations adopted in the world computer science. As a technological basis and a tool platform for the study of programming languages, the latest development of Microsoft Corporation is proposed - a complex of software based on the methodology . NET. The course aims to introduce the theory and practice of software systems development and consists of two interrelated stages, the teaching of which is physically divided into two semesters. The first semester is devoted to the basics of programming and theoretical introduction to computer science. The second semester involves (based on familiarity with the basics of programming theory and practice) more professional aspects of the implementation of heterogeneous software systems. This publication is part of the 'Library of Training Courses', the formation of which is carried out within the framework of the MSDN Academic Alliance (MSDN AA) academic cooperation program.