Performing validations on user input is something that all of us, as application developers, must do. When moving from a procedural to an object oriented approach many developers have difficulty determining how and where to perform validations. In this session you will be introduced to an object oriented approach to validations. This approach enables you to add validation "smarts" into your business objects, while keeping that logic fully encapsulated outside of the objects...

When making the move from a procedural to an object oriented approach one often comes across a pattern that involves using services and gateways to act as a middle man between a controller and your actual business objects. This session will present an approach to implementing a common set of services and gateways.Through the use of abstract classes you will see how to eliminate duplicate code and how to encapsulate logic to increase the cohesiveness of your entire model.