1. GroupDocs Documentation
    2. /
    3. GroupDocs.Annotation Product Family
    4. /
    5. GroupDocs.Annotation for .NET
    6. /
    7. Annotation basics
    8. /
    9. Add annotation to the document
    10. /
    11. Add underline annotation

    Add underline annotation

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    Underline annotation underlines text as shown in the picture below:

    You can specify the following properties of the UnderlineAnnotation class:

    • FontColor defines the color of the annotation text
    • Opacity allows you to set the annotation opacity
    • Points defines the annotation positions as array of points
    • UnderlineColor defines the color of the underline line

    To add an underline annotation, follow these steps:

    1. Instantiate the Annotator class. Specify the input document path or stream.
    2. Instantiate the UnderlineAnnotation class. Specify the appropriate properties (position, page number, etc).
    3. Call the Add method. Specify the UnderlineAnnotation class.
    4. Call the Save method. Specify the output document path or stream.

    The following code snippet shows how to add UnderlineAnnotation to the document:

    //Add underline annotation to the document from local disk
using (Annotator annotator = new Annotator("input.pdf"))
{
	UnderlineAnnotation underline = new UnderlineAnnotation
    {
    	CreatedOn = DateTime.Now,
        FontColor = 65535,
        BackgroundColor = 16761035,
        Message = "This is underline annotation",
        Opacity = 0.7,
        PageNumber = 0,
        UnderlineColor = 1422623, //Supported only Word and PDF documents
        Points = new List<Point>
        {
        	new Point(80, 730), new Point(240, 730), new Point(80, 650), new Point(240, 650)
        },
        Replies = new List<Reply>
        {
        	new Reply
            {
            	Comment = "First comment",
                RepliedOn = DateTime.Now
            },
            new Reply
            {
            	Comment = "Second comment",
                RepliedOn = DateTime.Now
            }
        }
    };
    annotator.Add(underline);
    annotator.Save("result.pdf");
}

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