The task of volume 2 of the textbook is to present in detail, accessible, using practical examples all the possibilities of the C # language, one of the most promising modern object-oriented programming languages. The course assumes a good command of the material set out in volume 1 of the textbook, and is designed to learn additional features of the C # language. We will discuss in detail how to work with strings, dates and times, with threads and the file system, ISON and XML (using practical examples), etc.