private void CheckButton_Click(object sender, EventArgs e) { CheckButton.Enabled = false; ResultLabel.ResetText(); string countryCode = ExtractCountryCodeFromInput(); string VATCode = ExtractVatCodeFromInput(); if (VatIsFine() && ValidateVatByCountryCode(countryCode, VATCode)) { CheckVatByVies(countryCode, VATCode); } else { ResultLabel.Text = MessageProvider.ErrorMessage(); } CheckButton.Enabled = true; }