Web Services with ASP.NET

A Web Service is programmable application logic accessible via standard Web protocols. One of these Web protocols is the Simple Object Access Protocol (SOAP). SOAP is a W3C submitted note (as of May 2000) that uses standards based technologies (XML for data description and HTTP for transport) to encode and transmit application data.
Consumers of a Web Service do not need to know anything about the platform, object model, or programming language used to implement the service; they only need to understand how to send and receive SOAP messages (HTTP and XML).

 

Soap Message

A SOAP message consists of several elements, most notably an envelope. The envelope encapsulates the data transmitted within the SOAP message. Below is a simple SOAP message complete with HTTP headers:

<?xml version="1.0"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
               xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
               xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance"
               xmlns:xsd="http://www.w3.org/1999/XMLSchema">
  <soap:Body>
    <PerfCounters xmlns="http://tempuri.org/"/>
  </soap:Body>
</soap:Envelope>

In the example above, we see the HTTP headers for the request, including the HTTP SOAPAction header, which is optionally used by the server for routing the SOAP message. Following the HTTP headers we find the body of the HTTP message. The body of the HTTP message is the SOAP request for a PerfCounters Web Service, which we are going to build.

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