ASP.NET MVC Html.BeginForm Problem

Ich habe eine Teilansicht

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<DomainModel.Entities.Product>" %>

<div class="item">
    <h3><%= Model.Name %></h3>
    <%= Model.Description %>

    <% using (Html.BeginForm("AddToCart", "Cart")) { %>
        <%= Html.Hidden("ProductID") %>
        <%= Html.Hidden("returnUrl", ViewContext.HttpContext.Request.Url.PathAndQuery) %>
        <input type="submit" value="+ Add to cart" />
    <% } %>

    <h4><%= Model.Price.ToString("c")%></h4>
</div>

Und hier ist der html-Code gerendert wird:

<div class="item"> 
    <h3>Kayak</h3> 
    A boat for one person
    <form action="" method="post">
        <input id="ProductID" name="ProductID" type="hidden" value="1" /> 
        <input id="returnUrl" name="returnUrl" type="hidden" value="/" /> 
        <input type="submit" value="+ Add to cart" /> 
    </form> 
    <h4>$275.00</h4> 
</div> 

Nichts passiert, wenn der submit-button geklickt wird, und ich bin ziemlich sicher, dass es ist, weil das form-action-Attribut hat keinen Wert. Sollte nicht BeginForm(action, controller) kümmern sich um das rendering aus der form Aktion? Was mache ich falsch?

BEARBEITEN

Code von CartController AddToCart Aktion:

    public RedirectToRouteResult AddToCart(Cart cart, int productID, string returnUrl)
    {
        Product product = productsRepository.Products.FirstOrDefault(p => p.ProductID == productID);

        cart.AddItem(product, 1);
        return RedirectToAction("Index", new { returnUrl });
    }

EDIT 2

Der Ansicht, dass die macht die partielle:

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <% foreach (var product in Model) { %>
        <% Html.RenderPartial("ProductSummary", product); %>
    <% } %>

    <div class="pager">
    Page:
    <%=Html.PageLinks((int)ViewData["CurrentPage"],
                      (int)ViewData["TotalPages"],
                      x => Url.Action("List", new { page = x, category = ViewData["CurrentCategory"] })) %>
    </div>
</asp:Content>

EDIT 3

Routen:

public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            null, //don't need a name
            "", //matches the root URL, i.e. ~/
            new { controller = "Products", action = "List", category = (string)null, page = 1 } //Defaults
        );

        routes.MapRoute(
            null, //don't need name
            "Page{page}", //URL pattern, e.g. ~/Page683
            new { controller = "Products", action = "List", category = (string)null }, //defaults
            new { page = @"\d+" } //constraints: page must be numerical
        );

        routes.MapRoute(null,
            "{category}",
            new { controller = "Products", action = "List", page = 1 });

        routes.MapRoute(null,
            "{category}/Page{page}",
            new { controller = "Products", action = "List" },
            new { page = @"\d+" } //constraints: page must be numerical
        );

    }