突出显示子菜单而不突出显示主菜单

Question

我有一个菜单，旁边显示子菜单。

            foreach (Category menuItem in lstMenu)
        {
            if (menuItem.ParentID == 0) //if its a main menu element
            {
                if (menuItem.CategoryID == requestedid)//if its the requested menu, highlight it
                {
                    objStringBuilder.Append("<li class='active'><a href='Listing?id=" + menuItem.CategoryID + "&name=" + menuItem.CategoryDescription + "'>" + menuItem.CategoryDescription + "</a></li>");
                }
                else// if not, then dont
                {
                    objStringBuilder.Append("<li><a href='Listing?id=" + menuItem.CategoryID + "&name=" + menuItem.CategoryDescription + "'>" + menuItem.CategoryDescription + "</a></li>");
                }
            }
            else //if its a submenu element
            {
                if (menuItem.CategoryID == requestedid)//if its the requested submenu, highlight it
                {
                    objStringBuilder.Append("<ul class='nav navbar-nav2'><li class='active'><a href='Listing?id=" + menuItem.CategoryID + "&name=" + menuItem.CategoryDescription + "'>" + menuItem.CategoryDescription + "</a></li></ul>");
                }
                else// if not, then dont
                {
                    objStringBuilder.Append("<ul class='nav navbar-nav2'><li><a href='Listing?id=" + menuItem.CategoryID + "&name=" + menuItem.CategoryDescription + "'>" + menuItem.CategoryDescription + "</a></li></ul>");
                }
            }
        }

我需要的是，当子菜单突出显示时，主菜单元素不应该是。当然它会突出显示子菜单（当请求子菜单时）以及主菜单元素（子菜单的父级）。我该怎么办？