ASP.NET v2.0 has a couple new ways to reference connection strings stored in the web.config or machine.config file.
Book Review - Building Intelligent .NET Applications
(Agents, Data Mining, Rule-Based Systems, and Speech Processing)
Sara Morgan Rea
By default the Roles provider is defined in machine.config but it isn't enabled. Attempting to use the Roles feature before it is enabled will throw the following error: