Design of the Validation Application Block

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The Validation Application Block is designed to do the following:

• Encapsulate the logic used to perform the most common validation tasks into minimal application code.
• Relieve developers of the requirement to write duplicate code and custom code for common validation tasks.
• Allow validation rules to be changed after the application has been deployed, and ensure that changes happen simultaneously and consistently.

Design Highlights

Figure 1 illustrates the interrelationships between the key classes in the Validation Application Block.

Figure 1: Diagram of Validation Application Block

The client code can call the Validation façade, which allows you to create a validator and validate an object with a single line of code. Alternatively, it can call the ValidationFactory class to create a validator and then call the Validate method on the Validator class to perform the check.