WSDL in .net webservices

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  1. The Web Service on the Server side
  2. The client application calling the Web Service via a Web Reference
  3. A WSDL Web Service description that describes the functionality of the Web Service

A WSDL file describes all the methods and method signatures, as well as the namespaces and the handling URL for the Web Service in an XML document. This document works very much like a type library does in COM for the client application to determine what functionality is available in the Web Service. Visual Studio.Net uses the WSDL file to create a Web Reference on the client side from your Web Service. It reads the WSDL file and based on the definitions found in the WSDL file creates a proxy class that mimics the interface of the Web Service. The resulting class is actual source code that you can look at (see Web References sidebar). Because this class is actually linked into your client project the class becomes available in IntelliSense and you can actually see the full interface of the class as you type.

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