public ActionResult JoinBoard(JoinPriorityListCommand command)
        {
            if (ModelState.IsValid)
            {

                return RedirectToAction("List", command);
            }
            return View();
        }
        public ActionResult List(JoinPriorityListCommand command)
        {
            var board = repo.GetOrCreate(command.BoardName, command.UserName);

            return View(board);
        }