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// For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
// initialize DocFormat
DocFormat docFormat = new DocFormat(Common.MapSourceFilePath(filePath));

// initialize DocMetadata
DocMetadata docMetadata = docFormat.DocumentProperties;
                    
//update document property...
docMetadata.Author = "Usman";
docMetadata.Company = "Aspose";
docMetadata.Manager = "Usman Aziz";

//save output file...
docFormat.Save(Common.MapDestinationFilePath(filePath));