private void tryToAutentize(string name, string password)
        {
            User autentizedUser     = serverProxy.autentizate(new Credentials(name, password));
            bool wasLoginSuccessful = autentizedUser != null;

            if (wasLoginSuccessful)
            {
                setAutentizedUser(autentizedUser);
                setState(ClientState.AUTENTIZED_SUCCESSFULLY);
                setState(ClientState.ALL_PRODUCTS_OFFERED);
            }
            else
            {
                setState(ClientState.AUTENTIZATION_FAILED);
                setState(ClientState.UNAUTENTIZED);
            }
        }