RedirectToAction not working?

Question

i have child called "shipmentitemlist" and parent named "shipmentlist".

 

in my child table  when i delete 1 row i need to redirect again in shipmenitemlist. the problem is didnot redirect to my child table.

 

this is my code..

 

public ActionResult Delete(int id, ShipmentItemFormModel model)
        {
            var ShipmentId = _shipmentService.GetAll();

            if (model.Id > 0)
            {
                try
                {
                    var shipmentItem = _shipmentItemService.Get(model.Id);
                    _shipmentItemService.Remove(shipmentItem);
                    return RedirectToAction("shipmentitemlist", "shipmentlist", new { id = ShipmentId });
                }
                catch (Exception ex)
                {
                    ModelState.AddModelError("CustomError", ex.Message);
                    return View(PrepareShipmentItemModel(model));
                }
            }
            return View(model);
        }