public ActionResult list(string query = null)
        {
            var data = _db.GetAllAttempts();

            if (!String.IsNullOrWhiteSpace(query))
            {
                return(new JsonNetResult(new { aaData = data.Where(P => true).ToList() }));
            }
            else
            {
                return(new JsonNetResult(new { aaData = data.ToList() }));
            }
        }