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// 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;

// instantiate the HtmlOptions object 
HtmlOptions options = new HtmlOptions();

options.IsResourcesEmbedded = false;

// set password if document is password protected. 
if (!String.IsNullOrEmpty(DocumentPassword))
options.Password = DocumentPassword;

// add watermark
Watermark watermark = new Watermark("This is watermark text");
watermark.Color = Color.Red;
watermark.Position = WatermarkPosition.Diagonal;
watermark.Width = 100;
watermark.FontName = "\"Comic Sans MS\", cursive, sans-serif";

options.Watermark = watermark; 

// get document pages in html form
List<PageHtml> pages = htmlHandler.GetPages(guid, options);

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