Using ASP.NET SOAP Headers and Extensions in Web Services for Orthogonal Interception Services

In the first part of this article, Aravind Corera looks at how SOAP Headers can be used to carry out-of-band data in SOAP messages, allowing you to design a cleaner business object model exposed by your web service. He explains why it's better to pass orthogonal data to web methods through SOAP headers instead of through method parameters.

In the second part of the article, Aravind explains ASP.NET SOAP Extensions in detail and builds an ASP.NET SOAP Extension that meters web service usage and provides encryption and authentication services.