private void validateValues() {

    if (txt_email.getText().toString().length() < 1) {

      GlobalClaass.showToastMessage(context, "Email address is required.");

      return;
    }

    if (!GlobalClaass.isValidEmail(txt_email.getText().toString())) {

      GlobalClaass.showToastMessage(context, "Invalid email address.");

      return;
    }

    if (txt_pass.getText().toString().length() < 1) {

      GlobalClaass.showToastMessage(context, "Password is required.");

      return;
    }
    if (GlobalClaass.isInternetPresent(context)) {

      loginservice =
          new LoginService(context, txt_email.getText().toString(), txt_pass.getText().toString());
      loginservice.execute();
    } else {
      GlobalClaass.showToastMessage(context, "Please check internet connection");
    }
  }