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Gets the serial number (in decimal format) of the certificate.
This property returns the serial number from the certificate associated with the signature details.
string CertificateSerialNumber { get; }
ReadOnly Property CertificateSerialNumber As String
workbook.Open(GetSignedWorkbookStream());
ISignature signature = workbook.Signatures[0];
IReadOnlySignatureDetails details = signature.Details;
string certificateSerialNumber = details.CertificateSerialNumber;