how use thermal printer in C# asp.net

   public static void PrintReceiptForTransaction()
        {
            PrintDocument recordDoc = new PrintDocument();

            recordDoc.DocumentName = "Customer Receipt";
            recordDoc.PrintPage += new PrintPageEventHandler(PrintReceiptPage); // function below
            recordDoc.PrintController = new StandardPrintController(); // hides status dialog popup
                                                                       // Comment if debugging
            PrinterSettings ps = new PrinterSettings();
            ps.PrinterName = "Black Copper BC-85AC";
            recordDoc.PrinterSettings = ps;
            recordDoc.Print();
            // --------------------------------------

            // Uncomment if debugging - shows dialog instead
            //PrintPreviewDialog printPrvDlg = new PrintPreviewDialog();
            //printPrvDlg.Document = recordDoc;
            //printPrvDlg.Width = 1200;
            //printPrvDlg.Height = 800;
            //printPrvDlg.ShowDialog();
            // --------------------------------------

            recordDoc.Dispose();
        }

        private static void PrintReceiptPage(object sender, PrintPageEventArgs e)
        {
            float x = 10;
            float y = 5;
            float width = 270.0F; // max width I found through trial and error
            float height = 0F;

            Font drawFontArial12Bold = new Font("Arial", 12, FontStyle.Bold);
            Font drawFontArial10Regular = new Font("Arial", 10, FontStyle.Regular);
            SolidBrush drawBrush = new SolidBrush(Color.Black);

            // Set format of string.
            StringFormat drawFormatCenter = new StringFormat();
            drawFormatCenter.Alignment = StringAlignment.Center;
            StringFormat drawFormatLeft = new StringFormat();
            drawFormatLeft.Alignment = StringAlignment.Near;
            StringFormat drawFormatRight = new StringFormat();
            drawFormatRight.Alignment = StringAlignment.Far;

       // Draw string to screen.
            string text = "Restuarant Name";
            e.Graphics.DrawString(text, drawFontArial12Bold, drawBrush, new RectangleF(x, y, width, height), drawFormatCenter);
            y += e.Graphics.MeasureString(text, drawFontArial12Bold).Height;

            text = "3 Emerson Road KIRK BRAMWITH";
            e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatCenter);
            y += e.Graphics.MeasureString(text, drawFontArial10Regular).Height;
            text = "-----------------------------------------------------";
            e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatCenter);
            y += e.Graphics.MeasureString(text, drawFontArial10Regular).Height;

            List<BE_Orders> list = new DAL_Restaurant.Repositories.DAL_Orders().GetbyPrintRecords( );
            text = "Table No. " +list.First().TableName;
            e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatLeft);
            DateTime? dt = list.First().DateAndTime;
            text = string.Format("{0:d}", dt)+" "+ string.Format("{0:t}", dt);
             e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatRight);
            y += e.Graphics.MeasureString(text, drawFontArial10Regular).Height;

            foreach (BE_Orders item in list)
            {


                text = item.ItemName;
                e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatLeft);
                text = "PKR " + item.Price.ToString();
                e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatRight);
                y += e.Graphics.MeasureString(text, drawFontArial10Regular).Height;
            }
            text = "-----------------------------------------------------";
            e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatCenter);
            y += e.Graphics.MeasureString(text, drawFontArial10Regular).Height;
            text = "TOTAL DUE";
            e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatLeft);

            double? total = list.Sum(item => item.Price);
            text = "PKR " + total.ToString();
            e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatRight);
            y += e.Graphics.MeasureString(text, drawFontArial10Regular).Height;
            text = "-----------------------------------------------------";
            e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatCenter);
            y += e.Graphics.MeasureString(text, drawFontArial10Regular).Height;

            text = "THANK YOU FOR DINING WITH US PLEASE COME AGAIN";
            e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatCenter);
            y += e.Graphics.MeasureString(text, drawFontArial10Regular).Height;
            // ... and so on        }