I am trying to get remote validation working in ASP.NET MVC 3 but for some reason the validation never gets fired. I am returning json from the controller and in FireFox it ask me to download the files. Not sure what is going on here. Here is my code:

@using(Html.BeginForm(new {Action = "ValidateUserName"})) {

<text> Enter UserName: </text> @Html.TextBoxFor(x => x.UserName) 

<input type="submit" value="Login" />  



}

Here is the RegistrationViewModel:

 public class RegistrationViewModel
    {
        [Required(ErrorMessage = "UserName is required!")]
        [Remote("ValidateUserName","Home",ErrorMessage ="UserName already taken!")]
        public string UserName { get; set; }
    }

And here is the HomeController:

  public ActionResult ValidateUserName(RegistrationViewModel registrationViewModel)
        {
            return Json(!registrationViewModel.UserName.Equals("test"),JsonRequestBehavior.AllowGet); 

        }