• Import the System.Web.Service namespace
• Add a directive line, specifying the class's language and namespace
• Derive the class from the .NET Class Library's WebService class
• Add the attribute WebMethodAttribute to each method you want to expose as a Web service method
• Put your code in a file with the extension .asmx and save in your Web server area.

Let's apply the main steps from above to our PrimeNumbers class. The directive line is the first line of the file and looks like this:

  <%@ WebService Language="JScript" class="PrimeNumbers" %>

  public class PrimeNumbers extends WebService {

  c:\inetpub\wwwroot\Webreference\checkIsPrime.asmx

  http://localhost/Webreference/checkIsPrime.asmx

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