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' For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
Using stream As Stream = New MemoryStream()
    Using doc As Document = Document.Load("C:\test.doc")
        '..
        ' watermarking goes here
        '..
        ' Saves the document to the underlying source (stream or file)
        doc.Save()

        ' Saves the document to the specified location
        doc.Save("C:\result.doc")

        ' Saves the document to the specified stream
        doc.Save(stream)
    End Using
End Using