通过HttpWebResponse和HttpWebRequest 获取http地址上的图片

HttpWebResponse resp;
        HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://www.csdn.net/Images/logo_csdn.gif");
        req.Timeout = 150000;
        resp = (HttpWebResponse)req.GetResponse();
        System.Drawing.Image img;
        img = new System.Drawing.Bitmap(resp.GetResponseStream());