The
DataSet Class is a collection of
DataTable classes that contain data retrieved from your database so that you can work with it.
To use the DataSet, you must first fill it with data from the database. Typically you use a DataAdapter to do so. Once you have retrieved data from your database it is loaded into memory for your application to do work with the data.
I have no idea what a "Database" class is.
The only "Database" classes I've ever seen were ones that I designed myself as a "database layer" in my applications.
If you ever need to find information about a control or class while developing in .NET, use the
MSDN Library. This library is provided by Microsoft to provide documentation on their classes, controls, concepts and much more.
-Frinny