A relational database offers more or less a static structure to store data. Often several tables and relations are needed to reach a minimum of flexibility. Nevertheless a relational database is still often the first choice for storing data. In some cases it may be better to store the data in a directory service like Active Directory Application Mode (ADAM), which can also provide user authentication for an application.
In this article Jörg Wegener describes how to implement ADAM within a web application and also takes advantage of the new security features in ASP.NET 2.0 to provide authentication.
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