Developing .NET Enterprise Applications is a complete guide to building a scalable enterprise application using .NET technologies. Other available books deeply describe individual Framework components, such as database, Windows Forms, or WebForms, but none tie all the technologies into a single scalable application.
When you start from short teaching an application to putting together such pieces as interaction with multi-tiers, varying back end databases, and legacy, the problems and techniques that are needed grow exponentially. The transition from learning a language to building an enterprise application is where the need for "guidebooks" is the greatest, and Developing .NET Enterprise Applications is designed to make the transition easier.