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// For complete examples and data files, please go to https://github.com/atirtahirgroupdocs/GroupDocs.Signature-for-.NET
SignatureConfig config = Utilities.GetConfigurations();
// instantiating the signature handler
var handler = new SignatureHandler(config);
// setup digital signature options
var signOptions = new CellsSignDigitalOptions("ali.pfx");
signOptions.Password = "";
string fileExtension = Path.GetExtension(fileName);
Utilities.SaveFile(fileExtension, fileName, handler, null, null, signOptions);