SaveFormat

public abstract SaveFormat SaveFormat { get; set; }

Document doc = new Document(MyDir + "Rendering.docx");

// Use a SaveOptions object to specify the encoding for a document that we will save.
HtmlSaveOptions saveOptions = new HtmlSaveOptions();
saveOptions.SaveFormat = SaveFormat.Epub;
saveOptions.Encoding = Encoding.UTF8;

// By default, an output .epub document will have all its contents in one HTML part.
// A split criterion allows us to segment the document into several HTML parts.
// We will set the criteria to split the document into heading paragraphs.
// This is useful for readers who cannot read HTML files more significant than a specific size.
saveOptions.DocumentSplitCriteria = DocumentSplitCriteria.HeadingParagraph;

// Specify that we want to export document properties.
saveOptions.ExportDocumentProperties = true;

doc.Save(ArtifactsDir + "HtmlSaveOptions.Doc2EpubSaveOptions.epub", saveOptions);