How To Genrate BarCode Code39 using c# in aspx page.

public void DrawingBarcode(string strNumber)
        {
            PrivateFontCollection fonts = new PrivateFontCollection();  
            //39码
            strNumber = "*" + strNumber + "*";
            fonts.AddFontFile(HttpContext.Current.Server.MapPath(".") + "/BarcodeFonts/FREE3OF9.TTF");
            FontFamily ff = new FontFamily("Free 3 of 9", fonts);         
            Font font = new Font(ff, 12);

            //设置图片大小
             System.Drawing.Image img =  new Bitmap(1, 1);
            Graphics g = Graphics.FromImage(img);
            SizeF fontSize = g.MeasureString(strNumber, font);
            int intWidth = Convert.ToInt32(fontSize.Width);
            int intHeight = Convert.ToInt32(fontSize.Height);
            g.Dispose();
            img.Dispose();

            img = new Bitmap(intWidth, intHeight);
            g = Graphics.FromImage(img);
            g.Clear(Color.White);
            g.CompositingQuality = CompositingQuality.HighQuality;
            g.SmoothingMode = SmoothingMode.HighQuality;
            g.DrawString(strNumber, font, Brushes.Black, 0, 0);
            MemoryStream stream = new MemoryStream();
            img.Save(stream, ImageFormat.Jpeg);
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ContentType = "image/Jpeg";
            HttpContext.Current.Response.BinaryWrite(stream.ToArray());
            g.Dispose();
            img.Dispose();
        }