Document pdfDocument = new Document(dataDir + "AddAnnotation.pdf");
TextAnnotation textAnnotation = new TextAnnotation(pdfDocument.Pages[1], new Aspose.Pdf.Rectangle(200, 400, 400, 600));
textAnnotation.Title = "Sample Annotation Title";
textAnnotation.Subject = "Sample Subject";
textAnnotation.State = AnnotationState.Accepted;
textAnnotation.Contents = "Sample contents for the annotation";
textAnnotation.Open = true;
textAnnotation.Icon = TextIcon.Key;
Border border = new Border(textAnnotation);
border.Width = 5;
border.Dash = new Dash(1, 1);
textAnnotation.Border = border;
textAnnotation.Rect = new Aspose.Pdf.Rectangle(200, 400, 400, 600);
pdfDocument.Pages[1].Annotations.Add(textAnnotation);
dataDir = dataDir + "AddAnnotation_out.pdf";
pdfDocument.Save(dataDir);