Adding CSS class to Html.BeginForm()

Html.BeginForm("Index", "EIApplication", FormMethod.Post, new { enctype = "multipart/form-data", **@class = "nea-forms"** })

There is an overload for that, if you supply the controller action, name, and form method.

@using (Html.BeginForm("ActionName", "ControllerName", 
            new { ReturnUrl = ViewBag.ReturnUrl }, 
            FormMethod.Post, new { @class="login-form" }))
{
  etc.
}