Documents for Excel .NET Edition | GCDocuments
GrapeCity.Documents.Excel Namespace / ISignatureSet Interface / AddNonVisibleSignature Method
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    AddNonVisibleSignature Method
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    Creates a signature packet when digitally signing a document. The signature will be discarded if you save the workbook without signing it.
    Syntax
    ISignature AddNonVisibleSignature()
    See Also