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' For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
Document.DefaultSearchableObjects = New SearchableObjects() With { _
     .WordsSearchableObjects = WordsSearchableObjects.Hyperlinks Or WordsSearchableObjects.Text, _
     .CellsSearchableObjects = CellsSearchableObjects.HeadersFooters, _
     .SlidesSearchableObjects = SlidesSearchableObjects.SlidesBackgrounds Or SlidesSearchableObjects.Shapes, _
     .DiagramSearchableObjects = DiagramSearchableObjects.None, _
     .PdfSearchableObjects = PdfSearchableObjects.All _
}

For Each file As Object In Directory.GetFiles("D:\files")
    Using doc = Document.Load(file)

        ' The code for working with found watermarks goes here.
        Dim watermarks = doc.FindWatermarks()
    End Using