public AuthenticationCode(LoginPage page, string clientSecret, string instanceID, string uid, string pwd)
        {
            _page = page;

            _basicAuthValue = "Basic " + HelperStatics.encodeAuthHeader(_page.ClientID, clientSecret, Encoding.UTF8);

            _clientSecret = clientSecret;

            _postUsername = uid + "@" + instanceID;

            _postPwd = pwd;
        }