Apply custom font family iTextSharp(HTML to PDF)

I want to generate PDF from HTML using string builder.In that PDF report I have to apply custom fonts.Here is the sample source code which i tried.Can anyone have solutions?.Thanks

 

StringBuilder sb = new StringBuilder();

sb.Append("New Font Family");

MemoryStream HTMLstream = new MemoryStream(Encoding.UTF8.GetBytes(sb.ToString()));

MemoryStream cssstream = new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(System.IO.File.ReadAllText(HttpContext.Current.Server.MapPath("../Assets/css/pregamereport.css"))));

iTextSharp.text.Rectangle pageSize = new iTextSharp.text.Rectangle(613, 800);

Document pdfDoc = new Document(PageSize.A4, 10f, 20f, 20f, 1f);

fileName = "test";

string ReportLoaction = ConfigurationManager.AppSettings["BoxScoreReport"];

string newStatslocationsite = System.Web.HttpContext.Current.Server.MapPath(ReportLoaction);

if (!Directory.Exists(newStatslocationsite))

{

Directory.CreateDirectory(newStatslocationsite);

}

string finalpath = Path.Combine(newStatslocationsite, fileName);

FileStream createReport = new FileStream(finalpath, FileMode.Create);

PdfWriter writer = PdfWriter.GetInstance(pdfDoc, createReport);

pdfDoc.Open();

XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, HTMLstream, cssstream);

pdfDoc.Close();