    protected void convertToPdfButton_Click(object sender, EventArgs e)
    {
        // Create a PDF document
        Document pdfDocument = new Document();

        // Set license key received after purchase to use the converter in licensed mode
        // Leave it not set to use the converter in demo mode
        pdfDocument.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

        // Add a page to PDF document
        PdfPage pdfPage = pdfDocument.AddPage();

        // Set the encryption algorithm and the encryption key size if they are not the default ones
        if (!bit128RadioButton.Checked || !rc4RadioButton.Checked)
        {
            // set the encryption algorithm
            pdfDocument.Security.EncryptionAlgorithm = rc4RadioButton.Checked ? EncryptionAlgorithm.RC4 : EncryptionAlgorithm.AES;

            // set the encryption key size
            if (bit40RadioButton.Checked)
                pdfDocument.Security.KeySize = EncryptionKeySize.EncryptKey40Bit;
            else if (bit128RadioButton.Checked)
                pdfDocument.Security.KeySize = EncryptionKeySize.EncryptKey128Bit;
            else if (bit256RadioButton.Checked)
                pdfDocument.Security.KeySize = EncryptionKeySize.EncryptKey256Bit;
        }

        // Set user and owner passwords
        if (userPasswordTextBox.Text.Length > 0)
            pdfDocument.Security.UserPassword = userPasswordTextBox.Text;

        if (ownerPasswordTextBox.Text.Length > 0)
            pdfDocument.Security.OwnerPassword = ownerPasswordTextBox.Text;

        // Set PDF document permissions
        pdfDocument.Security.CanPrint = printEnabledCheckBox.Checked;
        pdfDocument.Security.CanPrintHighResolution = highResolutionPrintEnabledCheckBox.Checked;
        pdfDocument.Security.CanCopyContent = copyContentEnabledCheckBox.Checked;
        pdfDocument.Security.CanCopyAccessibilityContent = copyAccessibilityContentEnabledCheckBox.Checked;
        pdfDocument.Security.CanEditContent = editContentEnabledCheckBox.Checked;
        pdfDocument.Security.CanEditAnnotations = editAnnotationsEnabledCheckBox.Checked;
        pdfDocument.Security.CanFillFormFields = fillFormFieldsEnabledCheckBox.Checked;

        if ((PermissionsChanged(pdfDocument) || pdfDocument.Security.UserPassword.Length > 0) &&
            pdfDocument.Security.OwnerPassword.Length == 0)
        {
            // A user password is set but the owner password is not set or the permissions are not the default ones
            // Set a default owner password
            pdfDocument.Security.OwnerPassword = "owner";
        }

        try
        {
            // Create a HTML to PDF element to add to document
            HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(urlTextBox.Text);

            // Optionally set a delay before conversion to allow asynchonous scripts to finish
            htmlToPdfElement.ConversionDelay = 2;

            // Add the HTML to PDF element to document
            pdfPage.AddElement(htmlToPdfElement);

            // Save the PDF document in a memory buffer
            byte[] outPdfBuffer = pdfDocument.Save();

            // Send the PDF as response to browser

            // Set response content type
            Response.AddHeader("Content-Type", "application/pdf");

            // Instruct the browser to open the PDF file as an attachment or inline
            Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Set_Permissions_Password.pdf; size={0}", outPdfBuffer.Length.ToString()));

            // Write the PDF document buffer to HTTP response
            Response.BinaryWrite(outPdfBuffer);

            // End the HTTP response and stop the current page processing
            Response.End();
        }
        finally
        {
            // Close the PDF document
            pdfDocument.Close();
        }
    }