If I have two separate forms on a view, each containing a single dropdownlist and submit button, what's the best way to pass the list values to the view so I can perform validation on each dropdownlist/form separately?

I've currently got a ViewModel with two IEnumerable<SelectListItem> properties (both with [Required]) for the lists and assigning that to @Html.DropDownList(), but I can't seem to get the associated @Html.ValidationMessageFor() to trigger when submitting the list with the default "-- Select --" value.

Code:
@using (Html.BeginForm("Action1", "Controller"))
{ 
    @Html.AntiForgeryToken("Action1TokenSalt")
    <fieldset>
        <legend>List1</legend>
        <div class="editor-field">
            @Html.DropDownList("FooId", Model.List1Items, "-- Select --")
            @Html.ValidationMessageFor(m => m.List1Items)
        </div>
        <p>
            <input type="submit" value="Submit 1" />
        </p>
    </fieldset>
}
@using (Html.BeginForm("Action2", "Controller"))
{ 
    @Html.AntiForgeryToken("Action2TokenSalt")
    <fieldset>
        <legend>List2</legend>
        <div class="editor-field">
            @Html.DropDownList("FooId", Model.List2Items, "-- Select --")
            @Html.ValidationMessageFor(m => m.List2Items)
        </div>
        <p>
            <input type="submit" value="Submit 2" />
        </p>
    </fieldset>
}