Traditionally, a great number of business applications were developed using the J2EE framework. This fact has led to the emergence of a multitude of tools, manuals, etc. that explain the different alternatives or features needed to implement them. The development of .NET Framework has resulted in a strong demand for the implementation of applications using this kind of architecture. However, the quantity or quality of the documentation available is far from the one available for J2EE. This detail is especially worrying when the main objective set is to reveal the concepts of framework from a teaching point of view. This paper describes the teaching approach followed to achieve the abovementioned aim, based mainly on a set of simple tutorials that show the technology basics and two complete applications (miniportal and minibank) in which the application of design patterns when dealing with a business application is presented.