public IActionResult Index()
        {
            LoadData();
            AuthorizationsViewModel vm = new AuthorizationsViewModel();

            {
                List <string> userNames = new List <string>();
                foreach (var user in Users)
                {
                    userNames.Add(user.FirstName + " " + user.LastName);
                }
                vm.UserNames = new Microsoft.AspNetCore.Mvc.Rendering.SelectList(userNames);
            }
            {
                List <string> lockName = new List <string>();
                foreach (var l in Locks)
                {
                    lockName.Add(l.Name);
                }
                vm.LockNames = new Microsoft.AspNetCore.Mvc.Rendering.SelectList(lockName);
            }
            vm.Authorizations = Authorizations;
            return(View("Index", vm));
        }