How to Create PDF Document from html string with arabic characters and attach to mail

DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[3] {
		                    new DataColumn("OrderId"),
		                    new DataColumn("Product"),
		                    new DataColumn("Quanity")});
            dt.Rows.Add(101, "فيشنو", 5);
            dt.Rows.Add(102, "Jeans", 2);
            dt.Rows.Add(103, "Trousers", 12);
            dt.Rows.Add(104, "Shirts", 9);
            SendPDFEmail(dt);

private void SendPDFEmail(DataTable dt)
  {
      using (StringWriter sw = new StringWriter())
      {
          using (HtmlTextWriter hw = new HtmlTextWriter(sw))
          {
              string companyName = "ASPSnippets";
              int orderNo = 2303;
              StringBuilder sb = new StringBuilder();
              sb.Append("<table width='100%' cellspacing='0' cellpadding='2'>");
              sb.Append("<tr><td align='center' style='background-color: #18B5F0' colspan = '2'><b>Order Sheet</b></td></tr>");
              sb.Append("<tr><td colspan = '2'></td></tr>");
              sb.Append("<tr><td><b>Order No:</b>");
              sb.Append(orderNo);
              sb.Append("</td><td><b>Date: </b>");
              sb.Append(DateTime.Now);
              sb.Append(" </td></tr>");
              sb.Append("<tr><td colspan = '2'><b>Company Name :</b> ");
              sb.Append(companyName);
              sb.Append("</td></tr>");
              sb.Append("</table>");
              sb.Append("<br />");
              sb.Append("<table border = '1'>");
              sb.Append("<tr>");
              foreach (DataColumn column in dt.Columns)
              {
                  sb.Append("<th style = 'background-color: #D20B0C;color:#ffffff'>");
                  sb.Append(column.ColumnName);
                  sb.Append("</th>");
              }
              sb.Append("</tr>");
              foreach (DataRow row in dt.Rows)
              {
                  sb.Append("<tr>");
                  foreach (DataColumn column in dt.Columns)
                  {
                      sb.Append("<td>");
                      sb.Append(row[column]);
                      sb.Append("</td>");
                  }
                  sb.Append("</tr>");
              }
              sb.Append("</table>");
              StringReader sr = new StringReader(sb.ToString());

              Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
              HTMLWorker htmlparser = new HTMLWorker(pdfDoc);


              using (MemoryStream memoryStream = new MemoryStream())
              {
                  PdfWriter writer = PdfWriter.GetInstance(pdfDoc, memoryStream);
                  pdfDoc.Open();

                  var arialFontPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Fonts), "ARIALUNI.TTF");
                  FontFactory.Register(arialFontPath);
                  BaseFont bf = BaseFont.CreateFont(arialFontPath, BaseFont.IDENTITY_H, true);
                  iTextSharp.text.Font FontAr = new iTextSharp.text.Font(bf);
                  iTextSharp.text.FontFactory.RegisterDirectory(arialFontPath);

                  StyleSheet styles = new StyleSheet();
                  styles.LoadTagStyle("body", "face", "Arial Unicode MS");

                  var htmlarraylist = HTMLWorker.ParseToList(sr, styles).ToArray();
                  for (int k = 0; k < htmlarraylist.Count(); k++)
                  {
                      pdfDoc.Add((IElement)htmlarraylist[k]);
                  }

                  htmlparser.Parse(sr);
                  pdfDoc.Close();
                  byte[] bytes = memoryStream.ToArray();
                  memoryStream.Close();

                  System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
                  mail.To.Add("zzzz@gmail.com");
                  mail.From = new MailAddress("xyxyx@gmail.com", "PDF", System.Text.Encoding.UTF8);
                  mail.Subject = "iTextSharp PDF";
                  mail.Body = "iTextSharp PDF Attachment";
                  mail.BodyEncoding = System.Text.Encoding.UTF8;
                  mail.Attachments.Add(new Attachment(new MemoryStream(bytes), "iTextSharpPDF.pdf"));
                  mail.IsBodyHtml = true;
                  mail.Priority = MailPriority.High;
                  SmtpClient client = new SmtpClient();
                  client.Credentials = new System.Net.NetworkCredential("xxxx@gmail.com", "xxxx123");
                  client.Port = 587;
                  client.Host = "smtp.gmail.com";
                  client.EnableSsl = true;
                  try
                  {
                      Thread threadmail = new Thread(delegate()
                      {
                          client.Send(mail);
                      });

                      threadmail.IsBackground = true;
                      threadmail.Start();
                  }
                  catch (Exception ex)
                  {
                      Exception ex2 = ex;
                      string errorMessage = string.Empty;
                      while (ex2 != null)
                      {
                          errorMessage += ex2.ToString();
                          ex2 = ex2.InnerException;
                      }

                  }



              }
          }
      }
  }