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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (PdfDocument doc = Document.Load<PdfDocument>(Utilities.MapSourceFilePath (FilePath)))
{
    foreach (PdfPage page in doc.Pages)
    {
        foreach (PdfAnnotation annotation in page.Annotations)
        {
            Console.WriteLine(annotation.AnnotationType);
            if (annotation.Image != null)
            {
                Console.WriteLine(annotation.Image.Width);
                Console.WriteLine(annotation.Image.Height);
                Console.WriteLine(annotation.Image.GetBytes().Length);
            }
            Console.WriteLine(annotation.Text);
            Console.WriteLine(annotation.X);
            Console.WriteLine(annotation.Y);
            Console.WriteLine(annotation.Width);
            Console.WriteLine(annotation.Height);
            Console.WriteLine(annotation.RotateAngle);
        }
    }
}