Aspose::Words::Drawing::SignatureLine::get_Id method. Gets or sets identifier for this Signature line. This identifier can be associated with a digital Signature, when Signing Document using DigitalSignatureUtil. This value must be unique and by default it is randomly generated new Guid (NewGuid) in C++....digital signature, when signing document using DigitalSignatureUtil...signature line to a document, and then sign it using a digital...