so according to [Gu](http://weblogs.asp.net/scottgu/archive/2010/07/27/introducing-asp-net-mvc-3-preview-1.aspx) `IValidatableObject.Validate()` should get called when a controller validates it's model (i.e. before `ModelState.IsValid`) however simply making the model implement `IValidatableObject` doesn't seem to work, because `Validate(..)` doesn't get called.

Anyone know if there is something else I have to wire up to get this to work?

EDIT:

Here is the code as requested.

```
public class LoginModel : IValidatableObject
{
    [Required]
    [Description("Email Address")]
    public string Email { get; set; }

    [Required]
    [Description("Password")]
    [DataType(DataType.Password)]
    public string Password { get; set; }

    [DisplayName("Remember Me")]
    public bool RememberMe { get; set; }

    public int UserPk { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        var result = DataContext.Fetch( db => {

            var user = db.Users.FirstOrDefault(u => u.Email == Email);

            if (user == null) return new ValidationResult("That email address doesn't exist."); 
            if (user.Password != User.CreateHash(Password, user.Salt)) return new ValidationResult("The password supplied is incorrect.");

            UserPk = user.UserPk;
            return null;
        });

        return new List<ValidationResult>(){ result };
    }
}

```

The action. ( I don't do anything special in the Controller...)

```
[HttpPost]
public ActionResult Login(LoginModel model)
{
    if (ModelState.IsValid)
    {
        FormsAuthentication.SetAuthCookie(model.Email, model.RememberMe);
        return Redirect(Request.UrlReferrer.AbsolutePath);
    }

    if (ControllerContext.IsChildAction || Request.IsAjaxRequest())
        return View("LoginForm", model);

    return View(model);
}

```

I set a break point on the first line of `LoginModel.Validate()` and it doesn't seem to get hit.