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' For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
Using doc As PdfDocument = Document.Load(Of PdfDocument)(Utilities.MapSourceFilePath(FilePath))
    For Each page As PdfPage In doc.Pages
        For Each annotation As PdfAnnotation In page.Annotations
            Console.WriteLine(annotation.AnnotationType)
            If annotation.Image IsNot Nothing Then
                Console.WriteLine(annotation.Image.Width)
                Console.WriteLine(annotation.Image.Height)
                Console.WriteLine(annotation.Image.GetBytes().Length)
            End If
            Console.WriteLine(annotation.Text)
            Console.WriteLine(annotation.X)
            Console.WriteLine(annotation.Y)
            Console.WriteLine(annotation.Width)
            Console.WriteLine(annotation.Height)
            Console.WriteLine(annotation.RotateAngle)
        Next
    Next
End Using