This article explains how we can effectively de-couple the business logic layer of an application from the UI layer. It illustrates both binary coupling and XML coupling, explaining which one of the two is better to de-couple the business logic layer of an application from the user interface layer. I will show you how we can design a framework that will illustrate how we can achieve loose coupling between these layers. Let us name this framework as Business Process Execution Engine or BPEE in short.

The following sections discuss this framework, its objectives and shows how the same can be implemented in C#.