private async Task LoadUsers()
        {
            var usersReturned = await _userService.Get <List <Model.UserProfile> >(null);

            foreach (var item in usersReturned)
            {
                AllUsers.Add(item);
                QueryUsers.Add(item);
            }
        }
 private void SearchUsers(string searchQuery)
 {
     QueryUsers.Clear();
     foreach (var item in AllUsers)
     {
         if (item.Username.ToLower().Contains(searchQuery.ToLower()))
         {
             QueryUsers.Add(item);
         }
     }
 }