//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Pdf.Annotations;
namespace DsPdfWeb.Demos{    // This example shows how to load a password protected PDF without specifying the password,    // and add a square annotation (a red border along the sides of the page) to the first page of the PDF.    // The modified PDF is saved and re-opened with the password so that we can show it in the demo.    public class NoPassAddAnnotation    {        public int CreatePDF(Stream stream)        {            using var fsSrc = File.OpenRead(Path.Combine("Resources", "PDFs", "Wetlands-password-user.pdf"));            // Set up DecryptionOptions to allow loading password protected PDFs without password:            var dopt = new DecryptionOptions() { ThrowExceptionIfInvalidPassword = false };            var docSrc = new GcPdfDocument();            docSrc.Load(fsSrc, dopt);
            // Add a square annotation to the first page of the PDF:            var page = docSrc.Pages[0];            var pageSize = page.Size;            var sa = new SquareAnnotation()            {                Page = page,                Rect = new RectangleF(36, 36, pageSize.Width - 72, pageSize.Height - 72),                Color = Color.Red,            };            // Note: we must remove the UserName, as it is initialized by default which will cause an exception            // when the document is saved, because strings cannot be encrypted:            sa.UserName = null;
            // Demo site specific:            // We save the modified password protected document to a temp file,            // and load it again with the password, so that the demo site can show it            // without asking the user for a password (the block is to delete the temp file):            var fn = Path.GetTempFileName();            {                docSrc.Save(fn);                var doc = new GcPdfDocument();                using var fs = File.OpenRead(fn);                doc.Load(fs, "user");                doc.Save(stream);            }            File.Delete(fn);            return docSrc.Pages.Count;        }    }}