Perhaps the most revolutionary aspect of the arrival of Microsoft's .NET platform is the standardization of C# and the Common Language Runtime. Now, for the first time, programmers can develop and use open-source projects that are based on a language that is an international standard as well as compatible with both Microsoft and Linux platforms.
Open Source .NET Development is the definitive guide on .NET development in an open-source environment
Authors Brian Nantz and Laurence Moroney lay the foundation for a complete discussion of Web services security in the .NET platform by first describing the key aspects of security for the Windows operating system, Internet Information Services, and ASP.NET. They show developers how to use the WS-Security W3C specifications for industry-standard authentication, encryption, authorization, XML signature, attachments, and routing with Web services. The specific working code examples and clear-cut explanations will assist developers in readily integrating Web services security into their applications.

Mobile Database Development article - August 2006 Smartphone & Pocket PC Magazine!