图片的读取和保存操作

　　　　　public static void LoadPicFromStream(string url)
        {
            string content = string.Empty;
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("");
            request.Method = "GET";
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            Stream stream = response.GetResponseStream();
            Image image = Image.FromStream(stream);
            image.Save("", System.Drawing.Imaging.ImageFormat.Jpeg);
            
        }