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// For complete examples and data files, please go to https://github.com/groupdocs-viewer/GroupDocs.Viewer-for-.NET
ViewerConfig config = Utilities.GetConfigurations();

// Create html handler
ViewerHtmlHandler htmlHandler = new ViewerHtmlHandler(config);
string guid = DocumentName;

// Set html options to show grid lines
HtmlOptions options = new HtmlOptions();
options.CellsOptions.OnePagePerSheet = false;
            
// Set count rows to render into one page. Default value is 50.
options.CellsOptions.CountRowsPerPage = 50;
            
// Get pages
List<PageHtml> pages = htmlHandler.GetPages(guid, options);

foreach (PageHtml page in pages)
{
    //Save each page at disk
    Utilities.SaveAsHtml(page.PageNumber + "_" + DocumentName, page.HtmlContent);
}