How simple are you looking?

From that description, I would be building classes to hold the information, and perhaps a class to manage a list of those classes. As long as the classes are marked as Serializable, then you can use binary serialization, which would take about two lines of code to save and two lines to load. The resulting file will be a binary file that can't easily be read by anything else.

Alternatively, you could store everything in XML, which could be viewed and edited in Notepad, but which could be somewhat harder to store and load.