Export file word
1. Config for word page
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Charset = "";
HttpContext.Current.Response.ContentType = "application/vnd.ms-word";
HttpContext.Current.Response.AddHeader("Content-Disposition", "inline;filename=ContentDocument.doc");
HttpContext.Current.Response.Write(htmlBody.ToString());
HttpContext.Current.Response.End();
HttpContext.Current.Response.Flush();