public ActionResult TreeList(int?key) { if (key.HasValue) { var data = _Service.GetGroupPermissions(key.Value); return(PartialView("_TreeList", data)); } else { //ViewData["MasterForm"] = ReadViewHelper.PartialView(this, "_MasterForm", new ViewModel.UserGroup.UserGroupModel()); return(PartialView("_TreeList", new List <Models.UserGroupPermission>())); } }