//// 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;using System.Collections.Generic;using GrapeCity.Documents.Common;
namespace DsPdfWeb.Demos{    // This example shows how to find all occurrences of two words in a PDF document and    // underline those occurrences using the text markup underline annotation.    public class FindAndUnderline    {        public int CreatePDF(Stream stream)        {            // Load the PDF:            var doc = new GcPdfDocument();            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "The-Rich-History-of-JavaScript.pdf"));            doc.Load(fs);
            // Find all occurrences of "JavaScript" or "ECMAScript" using regex:            var ft = new FindTextParams("JavaScript|ECMAScript", wholeWord: false, matchCase: false, regex: true);            var found = doc.FindText(ft, null);
            // Add a text markup annotation to underline each occurrence:            foreach (var f in found)            {                var markup = new TextMarkupAnnotation()                {                    Page = doc.Pages[f.PageIndex],                    MarkupType = TextMarkupType.Underline,                    Color = Color.Red                };                List<Quadrilateral> area = new List<Quadrilateral>();                foreach (var b in f.Bounds)                    area.Add(b);                markup.Area = area;            }
            // Done:            doc.Save(stream);            return doc.Pages.Count;        }    }}