Fluent Validation vs Data Annotations: Which to Use?

What are the main differences between Fluent Validation and Data Annotations in .NET?

Fluent Validation offers a more expressive and flexible way to define validation rules, while Data Annotations are simpler and built into the framework.

Can you give me an example of how to use Fluent Validation?

Sure! You can create a validator class that inherits from AbstractValidator<T> and define rules using methods like RuleFor.

Are there any performance differences between the two?

Fluent Validation can be more performant in complex scenarios due to its ability to chain rules and customize validation logic.

Which one is better for large applications?

Fluent Validation is often preferred for large applications due to its flexibility and maintainability.