The book is dedicated to one of the most interesting parts of the new Microsoft .NET technology - the development of XML Web services. The basic techniques for creating Web services, their integration with database servers based on ADO.NET technology, procedures for creating distributed applications based on Web services, as well as the use of XML Web services in practice are considered. Provides information about the WSDL and SOAP languages used to develop services and client applications. The book is full of a large number of copyright examples of existing Web services with detailed comments. For programmers, developers and administrators of Web sites.