Programmatically encrypting a config-file in .NET

Question

Could somebody please do a rundown of how to programmatically encrypt a config-file in .NET, preferably in C#.

What I would like to do is do some kind of check on an

Answer 1

To summarize the answers and what I've found so far, here are some good links to answer this question:

• Encrypting Configuration Information in ASP.NET 2.0 Applications - 4GuysFromRolla.com
• How To: Encrypt Configuration Sections in ASP.NET 2.0 Using DPAPI - MSDN

Please feel free to complement with other links, maybe some to WinForms- or WPF-applications.