//
// ViewModel Classes
public class UserFormViewModel
{
    // properties
    public User User { get; private set; }
    public SelectList Roles { get; private set; }

    // Constructor
    public UserFormViewModel(User user)
    {
        User = user;
        Roles = new SelectList(Roles.All, ); //this is where I have problems
    }
}

<ul>
    <% foreach (var role in Roles as IEnumerable<SelectListItem>)) { %>
    <li><%= Html.CheckBox(role.ToString())%> <%= role.ToString() %></li>
    <% } %>
</ul>

<li><%= Html.CheckBox(role.ToString(),
     Roles.IsUserInRole(Model.User.Identity.LoginName, role.ToString())) %>
    <%= role.ToString() %>
</li>

<ul>
    <%
        string[] allroles = Roles.GetAllRoles();
        foreach (string role in allroles) {
    %>
    <li>
        <%= Html.CheckBox(role.ToString(), Roles.IsUserInRole(Model.UserName, role.ToString())) %>
        <%= role.ToString() %>
    </li>
    <% } %>

</ul>