public async Task <IActionResult> Index()
        {
            var users = _userDal.GetUsers();
            var roles = _roleDal.GetRoles();

            UserListViewModel model = new UserListViewModel();

            foreach (var user in users)
            {
                user.CurrentRoles = (List <string>)(await _userManager.GetRolesAsync(new VesizleUser()
                {
                    Id = user.Id, UserName = user.UserName
                }));
                user.SelectRoles = _mapper.Map <List <SelectListItem> >(roles.Where(role => !user.CurrentRoles.Contains(role.Name)));
            }

            model.Users = users;

            return(View(model));
        }