' For complete examples and data files, please go to https://github.com/groupdocsannotation/GroupDocs_Annotation_NET
Try
' Get input file stream
Dim inputFile As Stream = New FileStream(CommonUtilities.MapSourceFilePath(filePath), FileMode.Open, FileAccess.ReadWrite)
' Initialize list of AnnotationInfo
Dim annotations As New List(Of AnnotationInfo)()
' Text strikeout annotation
Dim strikeoutAnnotation As New AnnotationInfo() With { _
.Box = New Rectangle(CSng(101.76), CSng(688.73), CSng(321.85), 27), _
.PageNumber = 1, _
.SvgPath = "[{""x"":101.76,""y"":400.05},{""x"":255.9,""y"":400.05},{""x"":101.76,""y"":378.42},{""x"":255.91,""y"":378.42},{""x"":101.76,""y"":374.13},{""x"":423.61,""y"":374.13},{""x"":101.76,""y"":352.5},{""x"":423.61,""y"":352.5}]", _
.Type = AnnotationType.TextStrikeout, _
.CreatorName = "Anonym A." _
}
' Add annotation to list
annotations.Add(strikeoutAnnotation)
' Export annotation and save output file
CommonUtilities.SaveOutputDocument(inputFile, annotations, DocumentType.Pdf)
Catch exp As Exception
Console.WriteLine(exp.Message)
End Try