Data Application based on OO Concepts

I'm looking for an application developed in C# with following qualities, which is available as source code.

1. Based on OO Architecture
2. Must connect to DB.
3. Must handle atlea开发者_JAVA技巧st a "one to many master child" relationship (eg: Order and items ordered)
4. Should display the data using Datagrid or other similar controls.
5. Reports (either with report viewer or otherwise)

I want to understand the layering of objects better. Could you please help by providing some links.

This is very basic. Try code project or some good books:

http://www.codeproject.com/