public PdfLineAnnotationFacade AddLineAnnotation(
    PdfPoint start,
    PdfPoint end
)

Public Function AddLineAnnotation(
    start As PdfPoint,
    end As PdfPoint
) As PdfLineAnnotationFacade

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

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

    // Define an annotation's start and end points
    PdfPoint start = new PdfPoint(100, 100);
    PdfPoint end = new PdfPoint(150, 100);

    // Add a line annotation
    PdfLineAnnotationFacade lineAnnotation = pageFacade.AddLineAnnotation(start, end);

    // Specify the annotation parameters
    lineAnnotation.Author = "Brian Zetc";
    lineAnnotation.BorderStyle = PdfBorderStyle.DashDot;
    lineAnnotation.BorderWidth = 3;
    lineAnnotation.Color = new PdfRGBColor(0.8, 0.2, 0.1);
    lineAnnotation.Contents = "Made in PDF Document API";

    // 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)

  ' Define an annotation's start and end points
  Dim start As New PdfPoint(100, 100)
  Dim [end] As New PdfPoint(150, 100)

  ' Add a line annotation
  Dim lineAnnotation As PdfLineAnnotationFacade = pageFacade.AddLineAnnotation(start, [end])

  ' Specify the annotation parameters
  lineAnnotation.Author = "Brian Zetc"
  lineAnnotation.BorderStyle = PdfBorderStyle.DashDot
  lineAnnotation.BorderWidth = 3
  lineAnnotation.Color = New PdfRGBColor(0.8, 0.2, 0.1)
  lineAnnotation.Contents = "Made in PDF Document API"

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