public IReadOnlyList<PdfAnnotationFacade> Annotations { get; }

Public ReadOnly Property Annotations As IReadOnlyList(Of PdfAnnotationFacade)

using DevExpress.Pdf;
using System;
using System.IO;

using (PdfDocumentProcessor processor = new PdfDocumentProcessor())
{
    // Load a document
    processor.LoadDocument("..\\..\\Document.pdf");

    // Access the first page properties
    PdfPageFacade pageFacade = processor.DocumentFacade.Pages[0];

    // Define a rubber stamp rectangle
    PdfRectangle rubberStampRectangle = new PdfRectangle(663, 526, 763, 576);

    // Create a "Draft" rubber stamp annotation
    PdfRubberStampAnnotationFacade rubberStamp =
        pageFacade.AddRubberStampAnnotation(rubberStampRectangle,
        PdfRubberStampAnnotationIconName.Draft);
    rubberStamp.Author = "Jesse Faden";
    rubberStamp.Contents = "Made in PDF Document API";

    // Define a file attachment area
    PdfPoint attachmentPoint = new PdfPoint(52, 550);

    // Specify attachment data
    PdfFileAttachment attachment = new PdfFileAttachment()
    {
        CreationDate = DateTime.Now,
        Description = "This is my attached file",
        FileName = "MyAttach.txt",
        Data = File.ReadAllBytes("..\\..\\FileToAttach.txt")
    };

    // Create a file attachment annotation
    PdfFileAttachmentAnnotationFacade pdfFileAttachment =
        pageFacade.AddFileAttachmentAnnotation(attachmentPoint, attachment,
        PdfFileAttachmentAnnotationIconName.PaperClip);
    pdfFileAttachment.Author = "Nancy Skywalker";
    pdfFileAttachment.Contents = "Additional Content";

    // Specify a free text annotation area
    PdfRectangle freeTextRectangle = new PdfRectangle(14, 321, 145, 340);

    // Create a free text annotation in this area
    PdfFreeTextAnnotationFacade freeTextAnnotation =
       pageFacade.AddFreeTextAnnotation(freeTextRectangle, "Free Text Annotation");
    freeTextAnnotation.Author = "Rayn Anita W";

    // Add a callout line
    freeTextAnnotation.SetCallout(PdfAnnotationLineEndingStyle.OpenArrow, new PdfPoint(152,351));

    // Find the target phrase in the document
    string circleText = "dogfooded";
    PdfTextSearchResults searchResults = processor.FindText(circleText);

    if (searchResults.Status == PdfTextSearchStatus.Found)
    {
        // Define an area around the phrase to add an annotation
        PdfRectangle circleRectangle = searchResults.Rectangles[0].BoundingRectangle;

        // Create a circle annotation in this area
        PdfCircleAnnotationFacade circleAnnotation = pageFacade.AddCircleAnnotation(circleRectangle);
        circleAnnotation.Author = "Cardle Anita W";
        circleAnnotation.Contents = "It's better to say 'used' in this case";
    }

    // Save the result
    processor.SaveDocument("..\\..\\Result.pdf");
}

Imports DevExpress.Pdf
Imports System
Imports System.IO

Using processor As New PdfDocumentProcessor()
  ' Load a document
  processor.LoadDocument("..\..\Document.pdf")

  ' Access the first page properties
  Dim pageFacade As PdfPageFacade = processor.DocumentFacade.Pages(0)

  ' Define a rubber stamp rectangle
  Dim rubberStampRectangle As New PdfRectangle(663, 526, 763, 576)

  ' Create a "Draft" rubber stamp annotation
  Dim rubberStamp As PdfRubberStampAnnotationFacade =
     pageFacade.AddRubberStampAnnotation(rubberStampRectangle,
     PdfRubberStampAnnotationIconName.Draft)
  rubberStamp.Author = "Jesse Faden"
  rubberStamp.Contents = "Made in PDF Document API"

  ' Define a file attachment area
  Dim attachmentPoint As New PdfPoint(52, 550)

  ' Specify attachment data
  Dim attachment As New PdfFileAttachment() With 
  {
    .CreationDate = Date.Now,
    .Description = "This is my attached file",
    .FileName = "MyAttach.txt",
    .Data = File.ReadAllBytes("..\..\FileToAttach.txt")
  }

  ' Create a file attachment annotation
  Dim pdfFileAttachment As PdfFileAttachmentAnnotationFacade =
     pageFacade.AddFileAttachmentAnnotation(attachmentPoint, attachment,
      PdfFileAttachmentAnnotationIconName.PaperClip)
  pdfFileAttachment.Author = "Nancy Skywalker"
  pdfFileAttachment.Contents = "Additional Content"

  ' Specify a free text annotation area
  Dim freeTextRectangle As New PdfRectangle(14, 321, 145, 340)

  ' Create a free text annotation
  Dim freeTextAnnotation As PdfFreeTextAnnotationFacade =
     pageFacade.AddFreeTextAnnotation(freeTextRectangle, "Free Text Annotation")
  freeTextAnnotation.Author = "Rayn Anita W"

  ' Add a callout line
  freeTextAnnotation.SetCallout(PdfAnnotationLineEndingStyle.OpenArrow, New PdfPoint(152,351))

  ' Find the target phrase in the document
  Dim circleText As String = "dogfooded"
  Dim searchResults As PdfTextSearchResults = processor.FindText(circleText)

  If searchResults.Status = PdfTextSearchStatus.Found Then
    ' Define an area around the phrase to add an annotation
    Dim circleRectangle As PdfRectangle = searchResults.Rectangles(0).BoundingRectangle

    ' Create a circle annotation in this area
    Dim circleAnnotation As PdfCircleAnnotationFacade = pageFacade.AddCircleAnnotation(circleRectangle)
    circleAnnotation.Author = "Cardle Anita W"
    circleAnnotation.Contents = "It's better to say 'used' in this case"
  End If

  ' Save the result
  processor.SaveDocument("..\..\Result.pdf")
End Using

using (PdfDocumentProcessor processor = new PdfDocumentProcessor())
{
  // Load a document
  processor.LoadDocument("..\\..\\Document.pdf");
  PdfPageFacade pageFacade = processor.DocumentFacade.Pages[0];

  // Flatten annotations located
  // on the lower half of the first page
  double halfPage = processor.Document.Pages[0].CropBox.Top / 2;
  pageFacade.FlattenAnnotations(x => x.Rectangle.Top < halfPage);

  // Save the result
  processor.SaveDocument("..\\..\\Result.pdf");
}

Using processor As New PdfDocumentProcessor()
  ' Load a document
  processor.LoadDocument("..\..\Document.pdf")
  Dim pageFacade As PdfPageFacade = processor.DocumentFacade.Pages(0)

  ' Flatten annotations located
  ' on the lower half of the first page
  Dim halfPage As Double = processor.Document.Pages(0).CropBox.Top / 2
  pageFacade.FlattenAnnotations(Function(x) x.Rectangle.Top < halfPage)

  ' Save the result
  processor.SaveDocument("..\..\Result.pdf")
End Using

using DevExpress.Pdf;
using System.Linq;

using (PdfDocumentProcessor processor = new PdfDocumentProcessor())
{
    // Load a document
    processor.LoadDocument("..\\..\\Document.pdf");

    // Access the first page properties
    PdfPageFacade pageFacade = processor.DocumentFacade.Pages[0];

    // Retrieve all markup annotations
    var markups = pageFacade.Annotations.Where
            (annotation => annotation.Type != PdfAnnotationType.Link).ToList();
    foreach(PdfMarkupAnnotationFacade markupAnnotation in markups)
    {
        // Check the annotation author
        if (markupAnnotation.Author == "Brian Zetc")
        {
            // Remove the annotation
            markupAnnotation.Remove();
        }
    }
    // Save the result
    processor.SaveDocument("..\\..\\Result.pdf");
}

Imports DevExpress.Pdf
Imports System.Linq

Using processor As New PdfDocumentProcessor()
  ' Load a document
  processor.LoadDocument("..\..\Document.pdf")

  ' Access the first page properties
  Dim pageFacade As PdfPageFacade = processor.DocumentFacade.Pages(0)

  ' Retrieve all markup annotations
  Dim markups = pageFacade.Annotations.Where
    (Function(annotation) annotation.Type <> PdfAnnotationType.Link).ToList()
  For Each markupAnnotation As PdfMarkupAnnotationFacade In markups

    ' Check the annotation author
    If markupAnnotation.Author = "Brian Zetc" Then

      ' Remove the annotation
      markupAnnotation.Remove()
    End If
  Next markupAnnotation

  ' Save the result
  processor.SaveDocument("..\..\Result.pdf")
End Using