public bool EditUser(NavUser user, string pass)
        {
            try
            {
                User u = new User()
                {
                    No = user.No,
                    Adres = user.Address,
                    E_Mail = user.Email,
                    Firma = user.Company,
                    Kod_Pocztowy = user.PostalCode,
                    Kraj = user.CountryCode,
                    Miasto = user.City,
                    Nazwa = user.Name,
                    Portfel = 0
                };

                _user_service.Update(ref u);

                return true;
            }
            catch
            {
                return false;
            }
        }
        public bool AddUser(NavUser user, string pass)
        {
            try
            {
                User_Filter[] filterEmail = { new User_Filter() { Criteria = "=" + user.Email, Field = User_Fields.E_Mail } };
                User_Filter[] filterName = { new User_Filter() { Criteria = "=" + user.Name, Field = User_Fields.Nazwa } };

                var checkUserEmail = _user_service.ReadMultiple(filterEmail, "", 1);
                var checkUserName = _user_service.ReadMultiple(filterName, "", 1);

                if (checkUserEmail.Length > 0)
                {
                    throw new FaultException("E-mail already exists !");
                }

                else if (checkUserName.Length > 0)
                {
                    throw new FaultException("Name already exists !");
                }

                User u = new User()
                {
                    Adres = user.Address,
                    E_Mail = user.Email,
                    Firma = user.Company,
                    Kod_Pocztowy = user.PostalCode,
                    Kraj = user.CountryCode,
                    Miasto = user.City,
                    Nazwa = user.Name,
                    Portfel = 0,
                    FirmaSpecified = true
                };

                _user_service.Create(ref u);

                var usr = _user_service.ReadMultiple(filterEmail, "", 1);

                _user_service.UpdatePassword(usr[0].Key, pass);

                return true;
            }
            catch
            {
                throw;
            }
        }