bool IINGService.AddUser(User user)
        {
            using (var database = new INGDBEntities())
            {
                var query = database.Users.FirstOrDefault(u => u.username == user.username);

                if (query != null)
                {
                    return(false);
                }
                user.password = user.password.GetHashCode().ToString();
                database.Users.Add(user);
                database.SaveChangesAsync();
                return(true);
            }
        }