How to write UTF-8 characters to a pdf file using itextsharp?

I have tried a lot on google but not able to find..

Any help is appreciated.

Please find the code below:-

protected void Page_Load(object sender, EventArgs e)
    {
        StreamReader read = new StreamReader(@"D:\queryUnicode.txt", Encoding.Unicode);
        string str = read.ReadToEnd();

        Paragraph para = new Paragraph(str);

        FileStream file = new FileStream(@"D:\Query.pdf",FileMode.Create);

        Document pdfDoc = new Document();
        PdfWriter writer = PdfWriter.GetInstance(pdfDoc, file );

        pdfDoc.Open();
        pdfDoc.Add(para);
        pdfDoc.Close();

        Response.Write("Pdf file generated");
    }