MVC :: Save All Items From Listbox?

Controller:

public ActionResult Create(int id)
{
ViewData["ProductId"] = _repository.getLaborId(id);
ViewData["OperationOrderList"] = _repository.List<OperationOrder>();
return View();
}
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Create(OperationOrder operationOrder,OperationProduct operationProduct)
{
try
{
foreach (var R in ViewData["ProductId"]as SelectList)
{
_repository.Create<OperationProduct> (operationProduct);
}
_repository.Create<OperationOrder > (operationOrder);
return RedirectToAction("Index");
}
catch
{
return View();
}
}

View:

<%: Html.ListBox("ProductId")%>

Q:How can I save all itmes from listbox to another table, Have I use "foreach" to save ?