Discover how credit card validation codes work and protect against fraud. Learn about their placement, security role, and examples to secure online transactions.

To protect its products and software, Microsoft strictly regulates the sale and use of Windows software by embedding a validation code, also called a product key, in every copy of Windows. Should you ...

While you can create classes that contain their own validation code, there are scenarios where it makes sense to separate validation code from the properties it validates using DataAnnotations. In a ...

Validation should begin as close to your database as possible: in your Entity Framework entities. Here's how you can integrate validation code into both the entities the Entity Framework generates and ...

A recent tweet from Google’s Gary Illyes called attention to problem of invalid HTML. Google is fine with invalid HTML. Less well known is that there are negative outcomes associated with invalid HTML ...