Converting text from scanned image to editable text

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//Create a pdf document.
            PdfDocument doc = new PdfDocument();
            doc.LoadFromFile(@"Sample2.pdf");

            StringBuilder buffer = new StringBuilder();
            IList images = new List();

            foreach (PdfPageBase page in doc.Pages)
            {
                buffer.Append(page.ExtractText());
                foreach (Image image in page.ExtractImages())
                {
                    images.Add(image);
                }
            }

            doc.Close();

            //save text
            String fileName = "TextInPdf.txt";
            File.WriteAllText(fileName, buffer.ToString());

            //save image
            int index = 0;
            foreach (Image image in images)
            {
                String imageFileName
                    = String.Format("Image-{0}.png", index++);
                image.Save(imageFileName, ImageFormat.Png);
            }

            //Launching the Text file.
            System.Diagnostics.Process.Start(fileName);
        }