protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    htmlToPdfConverter.LicenseKey = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=";

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

    if (ownerPasswordTextBox.Text.Length > 0)
        htmlToPdfConverter.PdfSecurityOptions.OwnerPassword = ownerPasswordTextBox.Text;

    if (htmlToPdfConverter.PdfSecurityOptions.UserPassword != null && htmlToPdfConverter.PdfSecurityOptions.UserPassword.Length > 0 &&
        (htmlToPdfConverter.PdfSecurityOptions.OwnerPassword == null || htmlToPdfConverter.PdfSecurityOptions.OwnerPassword.Length == 0 ||
        htmlToPdfConverter.PdfSecurityOptions.UserPassword == htmlToPdfConverter.PdfSecurityOptions.OwnerPassword))
    {
        // A user password is set but the owner password is not set or is identical to user password
        // Set a different owner password
        htmlToPdfConverter.PdfSecurityOptions.OwnerPassword = htmlToPdfConverter.PdfSecurityOptions.UserPassword + "_owner";
    }

    // Set PDF document permissions
    htmlToPdfConverter.PdfSecurityOptions.CanPrint = printEnabledCheckBox.Checked;
    htmlToPdfConverter.PdfSecurityOptions.CanCopyContent = copyContentEnabledCheckBox.Checked;
    htmlToPdfConverter.PdfSecurityOptions.CanEditContent = editContentEnabledCheckBox.Checked;
    htmlToPdfConverter.PdfSecurityOptions.CanEditAnnotations = editAnnotationsEnabledCheckBox.Checked;
    htmlToPdfConverter.PdfSecurityOptions.CanFillFormFields = fillFormFieldsEnabledCheckBox.Checked;

    // Convert the HTML page to a PDF document in a memory buffer
    byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(urlTextBox.Text);

    // 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();
}