Web Services in ASP.NET

http://www.w3schools.com/webservices/ws_example.asp, http://www.tutorialspoint.com/asp.net/asp.net_web_services.htm, http://www.simple-talk.com/dotnet/asp.net/using-webservices-with-asp.net/, http://www.objectinnovations.com/CourseOutlines/418.html