How to Capture IP Camera Image

private void button2_Click(object sender, EventArgs e)
        {
            byte[] buffer = new byte[100000];
            int read, total = 0;
            try 
            {
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://192.168.1.253/nphMotionJpeg?Resolution=320x240&Quality=Standard");
                req.Method = "POST";
                //req.Timeout = 500;
                NetworkCredential cred = new NetworkCredential("Administrator", "admintdx");
                req.Credentials = cred;
                WebResponse resp = req.GetResponse();
                // get response stream

                Stream stream = resp.GetResponseStream();
                // read data from stream

                while ((read = stream.Read(buffer, total, 1000)) != 0)
                {
                    total += read;
                }
                // get bitmap

                Bitmap bmp = (Bitmap)Bitmap.FromStream(new MemoryStream(buffer, 0, total));
                pictureBox1.Image = bmp;

            }
            catch (Exception ex)
            {
                MessageBox.Show("Grab Error:" + ex, "Error!!");
            }


        }