private void WriteMHTHeader() { StringBuilder sb = new StringBuilder(256); string s = "=?utf-8?B?" + System.Convert.ToBase64String(Encoding.UTF8.GetBytes(FileName)) + "?="; sb.Append("From: ").AppendLine(s); sb.Append("Subject: ").AppendLine(s); sb.Append("Date: ").AppendLine(ExportUtils.GetRFCDate(DateTime.Now)); sb.AppendLine("MIME-Version: 1.0"); sb.Append("Content-Type: multipart/related; type=\"text/html\"; boundary=\"").Append(FBoundary).AppendLine("\""); sb.AppendLine(); sb.AppendLine("This is a multi-part message in MIME format."); sb.AppendLine(); ExportUtils.Write(Stream, sb.ToString()); }