Using ViewModels in ASP.NET MVC 2 - multiple forms

The approach is to use a composite viewmodel:-

namespace MyApp.Models

{
    public class MyCompositePageModel
    {
        public RegisterModel registerModel;
        public LoginModel loginModel;
    }
}

When you do that, inherit the View from it:

<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<rs30UserWeb.Models.RegisterModel>" %>

Then reference the individual models in the page:

<%= Html.TextBoxFor(m => m.loginModel.Email) %>
<%= Html.ValidationMessageFor(m => m.loginModel.Email) %>

Hope someone else finds this useful.

Rob