Passing parameter to controller action from a Html.ActionLink

Is there anything wrong with this html? I want to have a link in the masterpage to navigate to "CreateParts" view. I have action 'CreateParts' which have a parameter parentPartId in the controller 'PartList'.

<li id="taskAdminPartCreate" runat="server">
                                    <%= Html.ActionLink("Create New Part", "CreateParts", "PartList", new { parentPartId = 0 })%></li>

My controller action is like

public ActionResult CreateParts(int parentPartId)
    {
        HSPartList objHSPart = new HSPartList();
        objHSPart.Id = parentPartId;
        return View(objHSPart);
    }

When I click on 'Create New Part' in the menu in SiteMaster, I get exception. Please help me out of this.