public class Barcode : IHttpHandler    {        private object _code = "";        private int _height = 52;        private string code = "";        public void ProcessRequest(HttpContext context)        {            if (context.Request.QueryString["code"] != null)            {                _code = context.Request.QueryString["code"].ToString();                _code = "*" + _code + "*";            }            code = bar_code(_code);            int p_w = code.Length;   //int p_h = _height + 20;   int p_h = _height;            context.Response.ContentType = "image/gif";            Bitmap myBitmap = new Bitmap(p_w, p_h);            Graphics myGrap = Graphics.FromImage(myBitmap);            myGrap.Clear(Color.White);            for (int i = 0; i < p_w; i++)            {                Pen myPen = new Pen(Color.White, 1);                if (code.Substring(i, 1) == "|")                {                    myPen.Color = Color.Black;                }                myGrap.DrawLine(myPen, i, 0, i, _height);            }   //myGrap.DrawString(_code.ToString(), new Font("Courier New", 10), new SolidBrush(Color.Black), -4, _height);            myBitmap.Save(context.Response.OutputStream, ImageFormat.Gif);            context.Response.End();        }        public string bar_code(object str)        {            string strTmp = str.ToString();            string code = strTmp;            strTmp = strTmp.ToLower();            strTmp = strTmp.Replace("0", "_|_|__||_||_|");            strTmp = strTmp.Replace("1", "_||_|__|_|_||");            strTmp = strTmp.Replace("2", "_|_||__|_|_||");            strTmp = strTmp.Replace("3", "_||_||__|_|_|");            strTmp = strTmp.Replace("4", "_|_|__||_|_||");            strTmp = strTmp.Replace("5", "_||_|__||_|_|");            strTmp = strTmp.Replace("7", "_|_|__|_||_||");            strTmp = strTmp.Replace("6", "_|_||__||_|_|");            strTmp = strTmp.Replace("8", "_||_|__|_||_|");            strTmp = strTmp.Replace("9", "_|_||__|_||_|");            strTmp = strTmp.Replace("a", "_||_|_|__|_||");            strTmp = strTmp.Replace("b", "_|_||_|__|_||");            strTmp = strTmp.Replace("c", "_||_||_|__|_|");            strTmp = strTmp.Replace("d", "_|_|_||__|_||");            strTmp = strTmp.Replace("e", "_||_|_||__|_|");            strTmp = strTmp.Replace("f", "_|_||_||__|_|");            strTmp = strTmp.Replace("g", "_|_|_|__||_||");            strTmp = strTmp.Replace("h", "_||_|_|__||_|");            strTmp = strTmp.Replace("i", "_|_||_|__||_|");            strTmp = strTmp.Replace("j", "_|_|_||__||_|");            strTmp = strTmp.Replace("k", "_||_|_|_|__||");            strTmp = strTmp.Replace("l", "_|_||_|_|__||");            strTmp = strTmp.Replace("m", "_||_||_|_|__|");            strTmp = strTmp.Replace("n", "_|_|_||_|__||");            strTmp = strTmp.Replace("o", "_||_|_||_|__|");            strTmp = strTmp.Replace("p", "_|_||_||_|__|");            strTmp = strTmp.Replace("r", "_||_|_|_||__|");            strTmp = strTmp.Replace("q", "_|_|_|_||__||");            strTmp = strTmp.Replace("s", "_|_||_|_||__|");            strTmp = strTmp.Replace("t", "_|_|_||_||__|");            strTmp = strTmp.Replace("u", "_||__|_|_|_||");            strTmp = strTmp.Replace("v", "_|__||_|_|_||");            strTmp = strTmp.Replace("w", "_||__||_|_|_|");            strTmp = strTmp.Replace("x", "_|__|_||_|_||");            strTmp = strTmp.Replace("y", "_||__|_||_|_|");            strTmp = strTmp.Replace("z", "_|__||_||_|_|");            strTmp = strTmp.Replace("-", "_|__|_|_||_||");            strTmp = strTmp.Replace("*", "_|__|_||_||_|");            strTmp = strTmp.Replace("/", "_|__|__|_|__|");            strTmp = strTmp.Replace("%", "_|_|__|__|__|");            strTmp = strTmp.Replace("+", "_|__|_|__|__|");            strTmp = strTmp.Replace(".", "_||__|_|_||_|");            return strTmp;        }        public bool IsReusable        {            get            {                return false;            }        }    }