Data Validation

There are lots of mistakes an end user can make when entering or editing data, and often it's important to catch related issues as early as possible. The eXpressApp Framework includes a powerful and flexible validation engine and a large number of readily usable validation rules. The system is dynamic, so you can extend it with your own rule definitions and basically implement any business rule checking you need.

Validity of data is not a clearly defined status, so the eXpressApp Framework uses a system of context based checks. Validity checking can either be triggered by the user manually or it will be performed by the framework automatically at specific points. Once more this is extensible, so you can implement your own business logic in validator classes and your own (business) processes can leverage the checking functionality at any point.

Like the rest of the eXpressApp Framework, data validation works independently from the user interface. Once defined, your business rules will be adhered to, whether you're targetting the Windows Forms or the ASP.NET frontend, or whether you are checking them in a totally UI independent data import process.