private void Button_GuardarComo_Click(object sender, EventArgs e)
        {
            string         documentName = "Entrada Serial " + string.Format("{0:dd-MM-yy}", DateTime.Now);
            PDFGenerator   docpdf;
            SaveFileDialog svd = new SaveFileDialog {
                Title            = "Documentos - Guardar Como",
                Filter           = "Archivo Documentos|*.txt;*.pdf;*.doc;*.docx",
                InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments),
                FileName         = documentName,
                AddExtension     = true,
            };

            try {
                if (svd.ShowDialog() == DialogResult.OK)
                {
                    if (svd.FileName.EndsWith(".pdf"))
                    {
                        docpdf = new PDFGenerator(RichTextBox_EntradaSerial.Text, svd.FileName);
                        docpdf.Font(RichTextBox_EntradaSerial.Font);
                        docpdf.Landscape(false);
                        docpdf.Print();
                    }
                    else
                    {
                        StreamWriter saveText = new StreamWriter(svd.FileName, false, Encoding.GetEncoding(1252));
                        if (File.Exists(svd.FileName))
                        {
                            saveText.Write(RichTextBox_EntradaSerial.Text);
                            saveText.Flush();
                            saveText.Close();
                        }
                        else
                        {
                            saveText.Write(RichTextBox_EntradaSerial.Text);
                            saveText.Flush();
                            saveText.Close();
                        }
                    }
                }
            } catch (Exception) { }
        }