Cacher is the code snippet organizer for pro developers

// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (Document doc = Document.Load(Utilities.MapSourceFilePath (XlsFilePath)))
{
    PossibleWatermarkCollection possibleWatermarks = doc.FindWatermarks();

    // Remove possible watermark at the specified index from the document.
    possibleWatermarks.RemoveAt(0);

    // Remove specified possible watermark from the document.
    possibleWatermarks.Remove(possibleWatermarks[0]);

    doc.Save();
}