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.NET - Web Services

17.
What advantages have Web services over Component Object Model (COM) and Distributed Component Object Model (DCOM)?
The advantages of Web services over COM and DCOM are as follows:
  • Web services are simple to use and can be implemented on varied platforms.
  • Web services are loosely coupled; as a result, their interfaces and methods can be extended.
  • Web services do not carry any state information with them so that multiple requests can be processed simultaneously.
18.
Mention the namespace that you must import in code to build a Web service.
System.Web.Services is the elementary namespace, which must be imported to develop code of a Web service.
19.
What does the portType element of a WSDL document contain?
The portType element contains the operations exposed by the Web service, and the messages involved in the communication between the Web service and its consumers.
20.
What is DISCO?
DISCO is a technology developed by Microsoft to publish and discover Web services. It discovers URLs of all XML Web services located on a Web server and creates a list of these Web services in a file called as a DISCO file.
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