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

// set camera owner name
tiffFormat.ExifValues.CameraOwnerName = "camera owner's name";

// set user comment
tiffFormat.ExifValues.UserComment = "user's comment";

// commit changes
tiffFormat.Save(Common.MapDestinationFilePath(filePath));