Building Web Solutions with ASP.NET and ADO.NET

.NET Web Services

A .NET Web service is a class that inherits from System.Web.Services.WebService. This class is placed in a source file and saved with an .ASMX extension. Files with an .ASMX extension are a particular flavor of ASP.NET pages. The .ASMX file contains a directive that informs the ASP.NET run time about the nature of the file, the language in use throughout, and the main class that implements the service:

<%@ WebService Language="C#" Class="NWService" %>

The main class must match the name declared in the Class attribute and must be public:

[WebService(Namespace="bwslib/0735615780")]
public class NWService : WebService 
{
⋮
}

Indicating the base class for a .NET Web service is not mandatory. A Web service can also be architected ...