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I'm using FluentValidation for DataBase validations. just pass the Validation class the session in the Ctor. and do the validation inside the action something like: <pre><code>var validationResult = new ProdcutValidator(session).Validate(product); </code></pre> <hr> Update: Based on your example I add my example... <pre><code>public class CreateProductViewModel { public string Name { get; set; } public decimal Price { get; set; } } public class CreateProductViewModelValidator : abstractValidator<CreateProductViewModel> { private readonly ISession _session; public CreateProductViewModelValidator(ISession session) { _session = session; RuleFor(m => m.Name).NotEmpty(); RuleFor(m => m.Code).Must(m, Code => _session<Product>.Get(Code) == null); } } Controller: public ActionResult Create(CreateProductViewModel model) { var validator = new CreateProductViewModelValidator(); var validationResult =validator.Validate(model); if(!validationResult.IsValid) { // You will have to add the errors by hand to the ModelState's errors so the // user will be able to know why the post didn't succeeded(It's better writing // a global function(in your "base controller" That Derived From Controller) // that migrate the validation result to the // ModelState so you could use the ModelState Only. return View(model); } var product = new Product { Name = model.Name, Price = model.Price }; repository.AddProduct(product); return RedirectToAction("Index"); } </code></pre> <hr> Second update: If you insist using parameterless constructor you will have to use some <a href="http://en.wikipedia.org/wiki/Inversion_of_control" rel="nofollow">Inversion Of control container</a>, a static class that is something like the Factory of your objects. use it like this: <pre><code>public class CreateProductViewModelValidator : abstractValidator<CreateProductViewModel> { private readonly ISession _session; public CreateProductViewModelValidator() { _session = IoC.Container.Reslove<ISession>(); RuleFor(m => m.Name).NotEmpty(); RuleFor(m => m.Code).Must(m, Code => _session<Product>.Get(Code) == null); } } </code></pre> You can find many IoC containers, most famous are <a href="http://www.castleproject.org/container/" rel="nofollow">Windsor</a> and <a href="http://ninject.org/" rel="nofollow">Ninject</a>, You will need to register- instruct the container once to resolve all the ISession to return your's session object.
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