Export HTML (Arabic Language content) to PDF using iTextSharp in ASP.Net MVC

I am using the below code for HTML to PDF using iTextSharp but if there are other language characters those are not visible in pdf

Please tell me the solution for this 

                    <div class="col-sm-2 text-right pull-right">
                        @using (Html.BeginForm("ExportCommentsAsPdf", "MitigatingControlsAggregate", FormMethod.Post))
                        {
                            @Html.AntiForgeryToken()
                            <input type="hidden" name="GridHtml" />
                            <input id="exportZone" name="riskIDpdf" type="hidden" value="@Model.RiskID" />
                            <input id="exportBusinessLine" name="affiliatepdf" type="hidden" value="@Model.Affiliate" />
                            <input id="exportAffiliate" name="periodStartpdf" type="hidden" value="@Model.PeriodStart" />
                            <input id="exportFromDate" name="periodEndpdf" type="hidden" value="@Model.PeriodEnd" />
                            <button id="btnExportasPdf" type="submit" class="btn btn-info btn-submit btn-sm">
                                <span class="glyphicon glyphicon-export" aria-hidden="true"></span>Export to Pdf
                            </button>
                        }
                    </div>

$("#btnExportasPdf").click(function () {
    $("input[name='GridHtml']").val($("#Grid").html());
});

Controller code

        [HttpPost, ValidateAntiForgeryToken]
        [ValidateInput(false)]
        public FileResult ExportCommentsAsPdf(string GridHtml, string riskIdpdf, string affiliatepdf, string periodStartpdf, string periodEndpdf)
        {
            using (MemoryStream stream = new System.IO.MemoryStream())
            {
                string fileName = riskIdpdf + "_EP |" + affiliatepdf + " |" + "From : " + periodStartpdf + " |" + " To : " + periodEndpdf + ".pdf";
                StringReader sr = new StringReader(GridHtml);
                Document pdfDoc = new Document(PageSize.A1, 10f, 10f, 100f, 0f);
                BaseFont bfR = iTextSharp.text.pdf.BaseFont.CreateFont(BaseFont.TIMES_ROMAN, iTextSharp.text.pdf.BaseFont.CP1257, false);
                Font courier = new Font(Font.FontFamily.COURIER, 30, Font.BOLD, BaseColor.ORANGE);
                PdfWriter writer = PdfWriter.GetInstance(pdfDoc, stream);
                pdfDoc.Open();
                XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, sr);
                pdfDoc.Close();
                return File(stream.ToArray(), "application/pdf", fileName);
            }
        }