This sample shows how to add text annotations (sticky notes) to your PDF document using PdfPage.AddTextAnnotation(..) method.

AddTextAnnotation method returns an instance of PdfTextAnnotation class.

CopyC#
using System.Diagnostics;

namespace BitMiracle.Docotic.Pdf.Samples
{
    public static class Annotations
    {
        public static void Main()
        {
            // NOTE: 
            // When used in trial mode, the library imposes some restrictions.
            // Please visit http://bitmiracle.com/pdf-library/trial-restrictions.aspx
            // for more information.

            PdfDocument pdf = new PdfDocument();

            PdfPage page = pdf.Pages[0];
            const string content = "Lorem ipsum dolor sit amet, consectetur adipisicing elit";
            PdfTextAnnotation textAnnotation = page.AddTextAnnotation(10, 50, "Docotic.Pdf Samples", content);
            textAnnotation.Icon = PdfTextAnnotationIcon.Comment;
            textAnnotation.Opened = true;

            string pathToFile = "Annotations.pdf";
            pdf.Save(pathToFile);
            pdf.Dispose();

            Process.Start(pathToFile);
        }
    }
}
CopyVB.NET
Imports System.Diagnostics
Imports System.IO

Imports BitMiracle.Docotic.Pdf

Namespace BitMiracle.Docotic.Pdf.Samples
    Public NotInheritable Class Annotations
        Public Shared Sub Main()
            ' NOTE: 
            ' When used in trial mode, the library imposes some restrictions.
            ' Please visit http://bitmiracle.com/pdf-library/trial-restrictions.aspx
            ' for more information.


            Dim pdf As New PdfDocument()

            Dim page As PdfPage = pdf.Pages(0)
            Const content As String = "Lorem ipsum dolor sit amet, consectetur adipisicing elit"
            Dim textAnnotation As PdfTextAnnotation = page.AddTextAnnotation(10, 50, "Docotic.Pdf Samples", content)
            textAnnotation.Icon = PdfTextAnnotationIcon.Comment
            textAnnotation.Opened = True

            Dim pathToFile As String = "Annotations.pdf"
            pdf.Save(pathToFile)
            pdf.Dispose()

            Process.Start(pathToFile)
        End Sub
    End Class
End Namespace