private void btnValidarXML_Click(object sender, EventArgs e) { openFileDialog1.InitialDirectory = Application.StartupPath; openFileDialog1.Filter = "NFS-e (*.xml)|"; openFileDialog1.Title = "Localizar NFS-e"; asscshnfse.asscshnfse nfse = new asscshnfse.asscshnfse(); if (openFileDialog1.ShowDialog() == DialogResult.OK) { if (nfse.ValidarArquivoXML(openFileDialog1.FileName)) MessageBox.Show("Arquivo validado com sucesso!", "NFS-e", MessageBoxButtons.OK, MessageBoxIcon.Information); } }