This is the complete online chapter 'Exposing Web Services' from 'Professional ASP.NET' by Wrox Press. The chapter provides in depth information about creating and consuming Web Services using ASP.NET.
Tutorial Details:
ASP.NET .NET Professional ASP.NET : Exposing Web Services Tutorial
Web Services, in theory, aren't a new concept. They allow distributed applications to share business logic over a network. For example, the classic Web Service scenario is a stock quote service: one company provides a service that can accept requests for stock symbols and respond with stock quote details. A company building an investing site can then use the application logic provided by the stock quote company to retrieve stock quote detail. This problem sounds relatively simple, but it has been quite difficult to solve in the past. That's due largely to proprietary protocol formats, such as RMI, and the lock-down of open ports to only port 80 and port 443 (for HTTP and HTTPS traffic only).
Microsoft's Web Services use standard web protocols such as HTTP, and data description languages such as XML, to exchange data over common ports, utilizing the ubiquitous HTTP infrastructure support already in place.
The technical definition of a Web Service is programmable application logic accessible via standard web protocols. Behind this definition are two important points:
Programmable application logic . A Web Service is implementation-non-specific. The application logic can be implemented by components, by PERL scripts, or by any other mechanism that supports XML. Standard web protocols . Web Services use Internet transport protocols such as HTTP or SMTP. The union of XML and HTTP forms one of the new industry buzz words: Simple Object Access Protocol (SOAP) . SOAP is a W3C submitted note (as of May 2000) that uses HTTP and XML to encode and transmit application data.
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