Expert C 2005 business objects by Rockford Lhotka

By Rockford Lhotka

Rockford Lhotka is a truly influential speaker and writer during this area

Lhotka’s earlier variations have tested his personal industry position

Lhotka keeps to offer those books as his flagship IP in his conversing career

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That’s no different than if they made a typo while entering the data by hand, but user-entered data is always validated before being accepted by an application. The same must be true for automated data entry as well, or your application will fail. This scenario occurs in three main architectures: smart/rich clients, web pages with DHTML/ JavaScript, and AJAX-style web pages. If you deploy a Windows Forms client application to external workstations, it should be designed as a stand-alone application that calls your server application through Web Services.

In an ideal world, all of the business logic would exist in the Business Logic layer, but in reality, this is virtually impossible to achieve. In a web-based UI, validation logic is often included in the Presentation layer, so that the user gets a more interactive experience in the browser. Unfortunately, any validation that’s done in the web browser is unreliable, because it’s too easy for a malicious user to bypass that validation. Thus, any validation done in the browser must be rechecked in the Business Logic layer as well.

Traditionally, you would devise at least a 3-layer logical model that separates the interface, the business logic, and the data-management portions of the application. Today that’s rarely sufficient, because the “interface” layer is often physically split into two parts (browser and web server), and the “logic” layer is often physically split between a client or web server and an application server. Additionally, there are various application models that have been used to break the traditional business logic layer into multiple parts—model-view-controller and facade-data-logic being two of the most popular at the moment.

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