HttpWebRequest request;

            //验证码地址

            string picpath = "http://localhost:8034/Controls/ValidateCode.aspx";

            request = WebRequest.Create(picpath) as HttpWebRequest;

            request.Method = "GET";

            request.Timeout = 30000;

            request.AllowAutoRedirect = true;

            request.ContentType = "image/bmp";

            request.UserAgent = "Mozilla/5.0 (Windows NT 5.2; rv:11.0) Gecko/20100101 Firefox/11.0";

            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";

            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())

            {



                StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8"));

                Bitmap sourcebm = new Bitmap(sr.BaseStream);

                sr.Close();

                

              //SetLuma(sourcebm);//灰度处理

                //Repair(sourcebm);//修复

                pictureBox1.Image = sourcebm;

                //sourcebm.Save("veryfyCode.bmp");

                try

                {

                    /*

                    string _veryfyCode = Marshal.PtrToStringAnsi(OCR("veryfyCode.bmp", -1));

                    txt_Log.Text = _veryfyCode;

                    MessageBox.Show(_veryfyCode);