Passing data to Master Page in ASP.NET MVC

public class MasterViewData
{
    public ICollection<string> Navigation { get; set; }
}

public class IndexViewData : MasterViewData
{
    public string Name { get; set; }
    public float Price { get; set; }
}

public interface IViewDataFactory
{
    T Create<T>()
        where T : MasterViewData, new()
}

public class ProductController : Controller
{
    public ProductController(IViewDataFactory viewDataFactory)
    ...

    public ActionResult Index()
    {
        var viewData = viewDataFactory.Create<ProductViewData>();

        viewData.Name = "My product";
        viewData.Price = 9.95;

        return View("Index", viewData);
    }
}

public class IndexViewData : MasterViewData
{
    public string Name { get; set; }
    public float Price { get; set; }
    public SubViewData SubViewData { get; set; }
}

<% Html.RenderPartial("Sub", Model.SubViewData); %>

<script runat="server" type="text/C#">
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        MasterModel = SiteMasterViewData.Get(this.Context);
    }

    protected SiteMasterViewData MasterModel;
</script>