The subject of the book is a consideration of the features of application development in the Visual Studio .Net 2003 environment, using the programming languages ​ ​ C++ and C #. The book on presentation style and content is designed for professional programmers. For clarity of the material, diagrams, figures, tables are used, as well as explanatory example programs are given. A comparative analysis was carried out for algorithmic languages. The convenience of creating applications in C # is disclosed. The analogy of this language with the Visual Basic .Net language is described. The basics of working with data are revealed, ADO and XML technologies are studied.