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// For complete examples and data files, please go to https://github.com/groupdocsannotation/GroupDocs_Annotation_NET
// Get input file stream
Stream inputFile = new FileStream(CommonUtilities.MapSourceFilePath(filePath), FileMode.Open, FileAccess.ReadWrite);
                
// Initialize list of AnnotationInfo
List<AnnotationInfo> annotations = new List<AnnotationInfo>();

// Arrow annotation
AnnotationInfo arrowAnnotation = new AnnotationInfo
{
    AnnotationPosition = new Point(852.0, 252.0),
    Box = new Rectangle(279.4742f, 252.9241f, 129.9555f, -9.781596f),
    PageNumber = 0,
    PenColor = 1201033,
    PenStyle = 0,
    PenWidth = 1,
    SvgPath = "M279.47417840375584,252.92413145539905 L129.9554929577465,-9.781596244131455",
    Type = AnnotationType.Arrow,
    CreatorName = "Anonym A."
};
// Add annotation to list
annotations.Add(arrowAnnotation);
                
// Export annotation and save output file
CommonUtilities.SaveOutputDocument(inputFile, annotations, DocumentType.Slides);