Placing Attributes

<%@ WebService Language="C#"
Class="ProgWS.HelloWorldService" %>
using System.Web.Services;
namespace ProgWS
{
  public class HelloWorldService: WebService 
  {
    [WebMethod]
    public string HelloWorld()
    {
      return "Hello World";
    }
  }
}

• You must specify the webservice directive and give it a language and class.
• The WebMethod can have
  • Description: a text description.
  • MessageName: the name of the SOAP message.
  • EnableSession: HTTP sessions.
  • CacheDuration: how long to cache request/response pair.
  • TransactionOption: is it a database transaction? (atomic, can be rolled back)