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Gets a value indicating whether this is a signature line. Read-only.
Use this property to distinguish a visible signature line added by AddSignatureLine(IWorksheet, double, double, double, double) from a non-visible signature created by AddNonVisibleSignature().
bool IsSignatureLine { get; }
ReadOnly Property IsSignatureLine As Boolean
ISignature signature = workbook.Signatures.AddSignatureLine(worksheet, 100.0, 50.0);
bool isSignatureLine = signature.IsSignatureLine;