// For complete examples and data files, please go to https://github.com/groupdocs-viewer/GroupDocs.Viewer-for-.NET
// get Configurations
ViewerConfig config = Utilities.GetConfigurations();
// create html handler
ViewerHtmlHandler htmlHandler = new ViewerHtmlHandler(config);
// guid implies that unique document name
string guid = DocumentName;
PrintableHtmlOptions printableHtmlOptions = new PrintableHtmlOptions();
// get printable html in PrintableHtmlContainer
PrintableHtmlContainer container = htmlHandler.GetPrintableHtml(guid, printableHtmlOptions);
// save html content
Utilities.SaveAsHtml(guid, container.HtmlContent);