Using Business Objects with WPF
As mentioned in Overview of MM .NET, rather than placing your business logic in the user interface, you should place it in methods of business objects. You should normally have at least two projects in your WPF solution - your WPF project and a Business Object project. For example:

You can add new business objects to the business object project, creating properties, events, and methods that can be accessed from the user interface. Whenever you want to reference a business object from a WPF Window or Page, remember to add a using or Imports statement for the business object's namespace.
For information on creating business objects, see Using the MM .NET Business Layer Generator.
See also:
Business Object Class Hierarchy | Data Access Overview | Registering Business Objects with a Windows Form | Getting References to Registered Business Objects
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