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// Setup GroupDocs.Viewer config
 ViewerConfig config = Utilities.GetConfigurations();
 
 ViewerHtmlHandler htmlHandler = new ViewerHtmlHandler(config);
 
 // File guid
 string guid = DocumentName;
 
 // Set html options to show grid lines
 HtmlOptions options = new HtmlOptions();
 //do same while using ImageOptions
 options.CellsOptions.ShowGridLines = true;
 
 List<PageHtml> pages = htmlHandler.GetPages(guid, options);