By default RichTextEditor automatically render html code to support AJAX. You can turn it off by setting this property to "false" for non-Ajax pages.
<% Dim rte Set rte=new RichTextEditor rte.Text="Type here" rte.RenderSupportAjax=false rte.ID="Editor1" rte.MvcInit() Response.Write(rte.GetString()) // use Request.Form("Editor1")to retrieve the data %>