// PM> Install-Package IronPdf
using IronPdf; 

// create a new PDF or load and edit an existing document.
using PdfDocument Pdf = PdfDocument.FromFile("existing.pdf");

// Create a PDF annotation object
var Annotation = new IronPdf.Annotations.TextAnnotation()
{
    Title = "This is the major title",
    Subject = "This is a subtitle",
    Contents = "This is the long 'sticky note' comment content...",
    Icon = IronPdf.Annotations.TextAnnotation.AnnotationIcon.Help,
    Opacity = 0.9,
    Printable = false,
    Hidden = false,
    OpenByDefault = true,
    ReadOnly = false,
    Rotateable = true
};

// Add the annotation "sticky note" to a specific page and location within any new or existing PDF.
Pdf.AddTextAnnotation(Annotation, 1, 150, 250);


Pdf.SaveAs("existing.pdf");

' PM> Install-Package IronPdf
Imports IronPdf

' create a new PDF or load and edit an existing document.
Private PdfDocument As using

' Create a PDF annotation object
Private Annotation = New IronPdf.Annotations.TextAnnotation() With {
	.Title = "This is the major title",
	.Subject = "This is a subtitle",
	.Contents = "This is the long 'sticky note' comment content...",
	.Icon = IronPdf.Annotations.TextAnnotation.AnnotationIcon.Help,
	.Opacity = 0.9,
	.Printable = False,
	.Hidden = False,
	.OpenByDefault = True,
	.ReadOnly = False,
	.Rotateable = True
}

' Add the annotation "sticky note" to a specific page and location within any new or existing PDF.
Pdf.AddTextAnnotation(Annotation, 1, 150, 250)


Pdf.SaveAs("existing.pdf")