''' <summary>
''' Gets and prints information about all annotations of PDF page.
''' </summary>
''' <param name="pdfFileName">The filename of PDF document.</param>
Public Shared Sub PrintAnnotationsInfo(pdfFileName As String)
    ' open PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName)
        ' for each PDF page
        For pageIndex As Integer = 0 To document.Pages.Count - 1
            ' get PDF page
            Dim page As Vintasoft.Imaging.Pdf.Tree.PdfPage = document.Pages(pageIndex)
            ' get a collection of annotations of PDF page
            Dim annotations As Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationList = page.Annotations
            If annotations Is Nothing Then
                System.Console.WriteLine("Page {0}: no annotations.", pageIndex + 1)
            Else
                ' print the page index and count of annotations
                System.Console.WriteLine("Page {0} Annotation count: {1}", pageIndex + 1, annotations.Count)
                ' for each annotation
                For Each annotation As Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotation In annotations
                    ' print information about annotation
                    System.Console.WriteLine("Annotation:")
                    System.Console.WriteLine("           Name: ""{0}""", annotation.Name)
                    System.Console.WriteLine(" Title (Author): ""{0}""", annotation.Title)
                    System.Console.WriteLine("        Subject: ""{0}""", annotation.Subject)
                    System.Console.WriteLine("       Contents: ""{0}""", annotation.Contents)
                    System.Console.WriteLine("AppearanceState: ""{0}""", annotation.AppearanceState)
                    System.Console.WriteLine("       Modified: {0}", annotation.Modified)
                    System.Console.WriteLine("          Flags: {0}", annotation.Flags)
                    System.Console.WriteLine()
                Next
            End If
        Next
    End Using
End Sub 

/// <summary>
/// Gets and prints information about all annotations of PDF page.
/// </summary>
/// <param name="pdfFileName">The filename of PDF document.</param>
public static void PrintAnnotationsInfo(string pdfFileName)
{
    // open PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document =
        new Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName))
    {
        // for each PDF page
        for (int pageIndex = 0; pageIndex < document.Pages.Count; pageIndex++)
        {
            // get PDF page
            Vintasoft.Imaging.Pdf.Tree.PdfPage page = document.Pages[pageIndex];
            // get a collection of annotations of PDF page
            Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotationList annotations = page.Annotations;
            if (annotations == null)
            {
                System.Console.WriteLine("Page {0}: no annotations.", pageIndex + 1);
            }
            else
            {
                // print the page index and count of annotations
                System.Console.WriteLine("Page {0} Annotation count: {1}", pageIndex + 1, annotations.Count);
                // for each annotation
                foreach (Vintasoft.Imaging.Pdf.Tree.Annotations.PdfAnnotation annotation in annotations)
                {
                    // print information about annotation
                    System.Console.WriteLine("Annotation:");
                    System.Console.WriteLine("           Name: \"{0}\"", annotation.Name);
                    System.Console.WriteLine(" Title (Author): \"{0}\"", annotation.Title);
                    System.Console.WriteLine("        Subject: \"{0}\"", annotation.Subject);
                    System.Console.WriteLine("       Contents: \"{0}\"", annotation.Contents);
                    System.Console.WriteLine("AppearanceState: \"{0}\"", annotation.AppearanceState);
                    System.Console.WriteLine("       Modified: {0}", annotation.Modified);
                    System.Console.WriteLine("          Flags: {0}", annotation.Flags);
                    System.Console.WriteLine();
                }
            }
        }
    }
}