public static readonly DocumentFormat Html

Public Shared ReadOnly Html As DocumentFormat

using(FileStream fs = new FileStream("Documents\\testDocumentHTML.html", FileMode.Open)) {
    documentServer.LoadDocument(fs, DevExpress.XtraRichEdit.DocumentFormat.Html);
    richEdit.Document.AppendDocumentContent(documentServer.Document.Range);

{
    wordProcessor.SaveDocument(htmlFileStream, DocumentFormat.Html);
}

RichEditDocumentFormat documentFormat = new RichEditDocumentFormat((int)format);
if (documentFormat == RichEditDocumentFormat.Html)
    server.Options.Export.Html.EmbedImages = true;

{
    richEditControl1.SaveDocument("test.html", DevExpress.XtraRichEdit.DocumentFormat.Html);
    var p = new Process();

dictF.Add(DocumentFormat.WordML, "xml");
dictF.Add(DocumentFormat.Html, "htm");
dictF.Add(DocumentFormat.Mht, "mht");

Using fs As New System.IO.FileStream("Documents\tesDocumentHTML.html", System.IO.FileMode.Open)
    documentServer.LoadDocument(fs, DevExpress.XtraRichEdit.DocumentFormat.Html)
    richEdit.Document.AppendDocumentContent(documentServer.Document.Range)

Using htmlFileStream As System.IO.FileStream = New System.IO.FileStream(filePath, System.IO.FileMode.Create)
    wordProcessor.SaveDocument(htmlFileStream, DevExpress.XtraRichEdit.DocumentFormat.Html)
End Using

Private Sub btnSave_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnSave.Click
    richEditControl1.SaveDocument("test.html", DevExpress.XtraRichEdit.DocumentFormat.Html)
    Dim p As New Process()

dictF.Add(DocumentFormat.WordML, "xml")
dictF.Add(DocumentFormat.Html, "htm")
dictF.Add(DocumentFormat.Mht, "mht")

Response.ContentType = "text/html"
Dim outputStream As Stream = ExecuteMerge(previewName, DocumentFormat.Html)
outputStream.Seek(0, SeekOrigin.Begin)