Add Highlight and Links Annotations to Annotate PDF documents using C#

AddHyperlinkInPDF.cs

// Create Hyperlinks in PDF using link annotations in C#
using (Annotator annotator = new Annotator(@"path/sample.pdf"))
{
    LinkAnnotation link = new LinkAnnotation
    {
        CreatedOn = DateTime.Now,
        PageNumber = 0,
        Points = new List<Point>
        {
            new Point(120, 300),
            new Point(600, 300),
            new Point(120, 270),
            new Point(600, 270)
        },
        Url = @"https://products.groupdocs.com/annotation"
    };
    annotator.Add(link);
    annotator.Save(@"path/annotation-link.pdf");
}

HighlightPDF.cs

// Highlight PDF using highlight annotation in C#
using (Annotator annotator = new Annotator(@"path/sample.pdf"))
{
    HighlightAnnotation highlight = new HighlightAnnotation
    {
        BackgroundColor = 0xFFF000,
        CreatedOn = DateTime.Now,
        Opacity = 0.5,
        PageNumber = 0,
        Points = new List<Point>
        {
            new Point(120, 270),
            new Point(600, 270),
            new Point(120, 300),
            new Point(600, 300)
        }
    };
    annotator.Add(highlight);
    annotator.Save(@"path/annotation-highlight.pdf");
}