Information about the Enterprise Library Configuration Application Block:
“Armed with our knowledge of XML Serialization, we can certainly start creating a solution for accessing and persisting global settings in our ASP.NET application. However, we may want to back up a bit and look at the Configuration Application Block created by the Microsoft Patterns and Practices Group. Even if we decide not to use the application block, we certainly want to at least understand how it works so we can justify our decision to our boss or client - but even more important, the guys at the next .NET Pub Club or Code Brew meeting!
After reading the documentation, one essentially runs the Enterprise Library Configuration Application to help create the configuration information that needs to be placed in the application's config file.”
Read more here.