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8849CH25.qxd  10/16/07  10:51 AM  Page 871

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At this point, your browser should launch, showing you the directory contents. Once you click

the HelloWorld.asmx file, you will see each “web method” exposed from this endpoint. At this point,

you can click the HelloWorld link to invoke the method via HTTP. Once you do, the browser will dis-

play the return value encoded as XML:

 

Hello World

 

Simple stuff, huh? Even better, when you wish to generate a client-side proxy file that can be

used to invoke web methods, you can make use of the wsdl.exe command-line tool or Visual

Studio’s Add Service Reference option under the Project menu. These same tools can be used to

generate a client-side *.config file, which contains various configuration settings for the proxy

(such as the web service endpoint) in a declarative manner. 

This proxy code will hide the details of manually working with HTTP connections and the

translation of XML data back into .NET data types. Assuming you have generated a proxy for this

simple web service (there is no need to do so here), the client application is able to invoke the web

method in a painfully simple manner, for example:

static void Main(string[] args)

{