Client and Server side validation in asp.net MVC application

Question

We are starting a new ASP.NET 3.5 MVC application. Following are the requirements for validation:

Both client and server side validation.
Validation rules in one place.
Common scenarios like 'Password' & 'Confirm Password' are addressed.

Options:

DataAnnotation (ONLY does server side validation)
EL 4.1 Validation Application Block (ONLY does server side validation)
xVal Framework
Validation Library framework
Validator Toolkit Framework
OTHERS ?

xVal and 'Validation Library' both can use DataAnnotation and jQuery validation plugin.

If a form has a field which is required for 'Create' but not required for 'Update', which of these frameworks can handle this scenario ?

Please advise which will be the best choice for MVC Client & Server validation ?

Thank You.

BengtBe · Accepted Answer · 2009-06-18 15:41:14Z

I can answer the others question :)

FluentValidation looks interesting. They provide a fluent syntax like:

public class CustomerValidator: AbstractValidator<Customer> {
    public CustomerValidator() {
        RuleFor(customer => customer.Surname).NotEmpty();
        RuleFor(customer => customer.Forename).NotEmpty().WithMessage("Missing first name");
    }
}

It also have some small integration with ASP.NET MVC, where you can add the result of the validation to the ModelState, as shown below:

public ActionResult Save(Customer customer) {
    var validator = new CustomerValidator();
    var results = validator.Validate(customer);
    results.AddToModelState(ModelState, "customer");
}

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