private void UpdateSubmitValid()
        {
            var validAddr = DirectConnectDialog.IsAddressValid(_addressBox.Text);
            var valid     = validAddr && !string.IsNullOrEmpty(_nameBox.Text);

            SubmitButton.IsEnabled = valid;
            TxtInvalid.IsVisible   = !validAddr;
        }
        private void UpdateSubmitValid()
        {
            var valid = DirectConnectDialog.IsAddressValid(_addressBox.Text) && !string.IsNullOrEmpty(_nameBox.Text);

            _submitButton.IsEnabled = valid;
        }