public PdfCaretAnnotationFacade AddCaretAnnotation(
    PdfRectangle rect
)

Public Function AddCaretAnnotation(
    rect As PdfRectangle
) As PdfCaretAnnotationFacade

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

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

    // Find the target phrase in the document
    string caretText = "Xbox";
    PdfTextSearchResults caretSearchResults = processor.FindText(caretText);

    if (caretSearchResults.Status == PdfTextSearchStatus.Found)
    {
      // Create a caret annotation
      PdfCaretAnnotationFacade caretAnnotation =
                pageFacade.AddCaretAnnotation(caretSearchResults.Rectangles[0].BoundingRectangle);
      caretAnnotation.Author = "Brian Zetc";
      caretAnnotation.Contents = "Trademark is missing";
    }

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

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)

  ' Find the target phrase in the document
  Dim caretText As String = "Xbox"
  Dim caretSearchResults As PdfTextSearchResults = processor.FindText(caretText)

  If caretSearchResults.Status = PdfTextSearchStatus.Found Then

    ' Create a caret annotation
    Dim caretAnnotation As PdfCaretAnnotationFacade = pageFacade.AddCaretAnnotation(caretSearchResults.Rectangles(0).BoundingRectangle)
    caretAnnotation.Author = "Brian Zetc"
    caretAnnotation.Contents = "Trademark is missing"
  End If

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