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How to design the class / interface structure for the following scenario

akulavi asked
Last Modified: 2012-05-08
first pls go through my entity structures .....

Foundation Classes
1. Customer        2. Journal       3. Publisher
In-Process Classes
1. Invoice

In the time of creation of Invoice I need the foundation classes. ie.
1.Customer - for whom I am going to make the Invoice
2. Journal - The main ingredients for making the Invoice
3. Journal belongs to some Publisher ....

As I am a newbie in OOPS ..... I just want to design the above system with the help of Class and interface(s). I am using VB.NET 2005.

Precisely I want to know that in which way I should start making my design so that it will be easier for me ???
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