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Real World XML Web Services: For VB and VB .NET Developers by Yasser Shohoud

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6.1. Creating Web Services with VS .NET

Web services are part of the ASP.NET framework, which means you do not need a special IDE to write a .NET Web service; you can build one using Notepad. A .NET Web service consists of a file with the .asmx extension and an optional assembly (for example .dll or .exe). This .asmx file is considered the Web service's end point; therefore, it must be placed in a Web accessible folder such as a Web application's vroot. The .asmx file contains a WebService processing directive such as:

<%@ WebService Language="vb" Class="MathService" %> 

The Language attribute specifies the language in which the Web service code is written. The Class attribute specifies the name of the class that represents the Web service. ...

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