.NET library that adds, edits, and removes annotations and markup — area and shape annotations, text Highlight/underline/strikeout, watermarks, image and link stamps, and threaded comments — on PDF, Word, Excel, PowerPoint, images, CAD, Visio, and email files. No Microsoft Office or Adobe Acrobat required....annotations, mark up text with highlights, underlines, strikeouts,...and opacity. Text Markup : Highlight, underline, strikeout, and...