public class WebMenu
{

    public WebMenu()
    {
        this.Children = new List<WebMenu>();
    }

    [Key]
    public int MenuID { get; set; }

    public string MenuName { get; set; }

    public int ParentID { get; set; }

    public string ControllerName { get; set; }

    public string ActionName { get; set; }

    public string ExternalLink { get; set; }

    public List<WebMenu> Children { get; set; }

}

[Route("content/{id:int}")]
    public ActionResult Content()
    {
        int id = Convert.ToInt32(Url.RequestContext.RouteData.Values["id"]);
        TempData["id"] = id;


        return View();
    }

public ActionResult MenuPartial()
        {
            dbContext = new DbContext();


            List<WebMenu> Menu = new List<WebMenu>();

             if (id!=0)
             {
                int id = (int)TempData["id"];
                Menu = dbContext.WebMenu.Where(x => x.MenuID == id).ToList();
             //I can get what is clicked.
            }

            WebMenu clickedMenu=Menu.FirstOrDefault();
            WebMenu parentMenu=dbContext.WebMenu.Where(x=>x.MenuID==clickedMenu.ParentID).ToList();


            }