Design Patterns In Constructing Multi-tier Web Application Based On .Net

Based on the trend which Microsoft .Net has being brought out, the author puts forward theopinion that using design patterns to change the orthodox three-tier architecture. Making use of apractical example's design process, talking about how to design multi-tier application system withB/S based on customer requirements, as well as the design essentials and realization details of itseach layer.Using Facade and Singleton patterns to solve the realization problem of Business Facade Layer;through the choice of business entity, the author introduces the solution of Business Entity Layer;OnDatabase Access Layer, the author discusses how to solve that a system must adapt to differentdatabase;based on software reuse, the author gives an idea of Portal Framework and discusses itsrealization details.