How can Hanlde Crystal Report Class?

Dear Frieands,

I'd like to add a "Property" or "Method" to a Crystal Report in VB.Net as a object oriented programming(OOP).
My problem clearly is that:

In vb.net i'd like to bound a class as a Data Layer to my Parent Crystal Report File (__.rpt) and call my Method to generate a new report dynamically, is's neccessary to handle the report class and create Method and peropery, how can do that?

Please help me