Assembly: System.Web.Services (in system.web.services.dll)
If you don't need access to the common ASP.NET objects, you can still create an XML Web service without deriving from WebService. Additional ASP.NET objects can be accessed through Context.
XML Web service methods that have the OneWay property of either SoapRpcMethodAttribute or SoapDocumentMethodAttribute set to true, do not have access to their HttpContext. As such, accessing any of the properties of the WebService class, from within that XML Web service method, return a null reference (Nothing in Visual Basic).
If you are using the .NET Framework version 1.0 XML Web service methods that have either the SoapRpcMethodAttribute or SoapDocumentMethodAttribute attribute applied to them with the OneWay property of set to true, do not have access to their HttpContext using the static Current property. To access the HttpContext, derive the class implementing the XML Web service method from WebService and access the Context property.
|Walkthrough: Creating and Using an ASP.NET Web Service in Visual Web Developer||Building ASP .NET Web Applications in Visual Studio|
The example below creates an XML Web service, deriving from WebService, in order to use the Context property to obtain the time of the request on the server.
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.