    using System;
    using System.Collections.Generic;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;

    // Use EVO PDF Namespace
    using EvoPdfClient;

    namespace EvoHtmlToPdfDemo.PDF_Creator.PDF_Security
    {
        public partial class PDF_Permissions_and_Password : System.Web.UI.Page
        {
            protected void convertToPdfButton_Click(object sender, EventArgs e)
            {
                // Get the server IP and port
                String serverIP = textBoxServerIP.Text;
                uint serverPort = uint.Parse(textBoxServerPort.Text);

                // Create a PDF document
                Document pdfDocument = null;
                if (radioButtonUseTcpService.Checked)
                    pdfDocument = new Document(serverIP, serverPort);
                else
                    pdfDocument = new Document(true, textBoxWebServiceUrl.Text);

                // Set optional service password
                if (textBoxServicePassword.Text.Length > 0)
                    pdfDocument.ServicePassword = textBoxServicePassword.Text;

                // 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";
                }

                // 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();
            }

            private bool PermissionsChanged(Document pdfDocument)
            {
                return !pdfDocument.Security.CanPrint || !pdfDocument.Security.CanPrintHighResolution ||
                        !pdfDocument.Security.CanCopyContent || !pdfDocument.Security.CanCopyAccessibilityContent ||
                        !pdfDocument.Security.CanEditContent || !pdfDocument.Security.CanEditAnnotations ||
                        !pdfDocument.Security.CanFillFormFields;
            }

            protected void Page_Load(object sender, EventArgs e)
            {
                if (!IsPostBack)
                {
                    sampleCodeLiteral.Text = System.IO.File.ReadAllText(Server.MapPath("~/DemoAppFiles/Input/Code_Samples/CSharp/AspNet/PDF_Creator/PDF_Security/PDF_Permissions.html"));
                    descriptionLiteral.Text = System.IO.File.ReadAllText(Server.MapPath("~/DemoAppFiles/Input/Descriptions/AspNet/PDF_Creator/PDF_Security/PDF_Permissions.html"));

                    Master.CollapseAll();
                    Master.ExpandNode("PDF_Creator");
                    Master.ExpandNode("PDF_Creator_PDF_Security");
                    Master.SelectNode("PDF_Creator_PDF_Permissions_and_Password");
                }
            }

            protected void editContentEnabledCheckBox_CheckedChanged(object sender, EventArgs e)
            {
                if (editContentEnabledCheckBox.Checked)
                    fillFormFieldsEnabledCheckBox.Checked = true;
            }

            protected void editAnnotationsEnabledCheckBox_CheckedChanged(object sender, EventArgs e)
            {
                if (editAnnotationsEnabledCheckBox.Checked)
                    fillFormFieldsEnabledCheckBox.Checked = true;
            }

            protected void fillFormFieldsEnabledCheckBox_CheckedChanged(object sender, EventArgs e)
            {
                if (!fillFormFieldsEnabledCheckBox.Checked)
                {
                    editContentEnabledCheckBox.Checked = false;
                    editAnnotationsEnabledCheckBox.Checked = false;
                }
            }

            protected void demoMenu_MenuItemClick(object sender, MenuEventArgs e)
            {
                switch (e.Item.Value)
                {
                    case "Live_Demo":
                        demoMultiView.SetActiveView(liveDemoView);
                        break;
                    case "Description":
                        demoMultiView.SetActiveView(descriptionView);
                        break;
                    case "Sample_Code":
                        demoMultiView.SetActiveView(sampleCodeView);
                        break;
                    default:
                        break;
                }
            }

            protected void rc4RadioButton_CheckedChanged(object sender, EventArgs e)
            {
                if (rc4RadioButton.Checked)
                {
                    // RC4 does not support the 256-bit encryption key size
                    bit256RadioButton.Enabled = false;
                    bit40RadioButton.Enabled = true;
                }
                else
                {
                    // AES does not support the 40-bit encryption key size
                    bit256RadioButton.Enabled = true;
                    bit40RadioButton.Enabled = false;
                }

                bit128RadioButton.Checked = true;
                bit40RadioButton.Checked = false;
                bit256RadioButton.Checked = false;
            }

            protected void aesRadioButton_CheckedChanged(object sender, EventArgs e)
            {
                if (rc4RadioButton.Checked)
                {
                    // RC4 does not support the 256-bit encryption key size
                    bit256RadioButton.Enabled = false;
                    bit40RadioButton.Enabled = true;
                }
                else
                {
                    // AES does not support the 40-bit encryption key size
                    bit256RadioButton.Enabled = true;
                    bit40RadioButton.Enabled = false;
                }

                bit128RadioButton.Checked = true;
                bit40RadioButton.Checked = false;
                bit256RadioButton.Checked = false;
            }
        }
    }