private void btnAssinar_Click(object sender, EventArgs e) { openFileDialog1.InitialDirectory = Application.StartupPath + "\\nfe\\arquivos"; openFileDialog1.Filter = "NF-e (*.xml)|"; openFileDialog1.Title = "Assinar NF-e"; if (openFileDialog1.ShowDialog() == DialogResult.OK) { lblStatus.Text = "Assinando arquivo, aguarde..."; lblStatus.Refresh(); nfec.nfecsharp nfe = new nfec.nfecsharp(); lblStatus.Text = nfe.AssinarArquivoXML(openFileDialog1.FileName, "infNFe"); } }