Taking print screen from html page

try
       {
           string content = "";

           System.Net.WebRequest webRequest = WebRequest.Create(url);
           System.Net.WebResponse webResponse = webRequest.GetResponse();
           System.IO.StreamReader sr = new StreamReader(webResponse.GetResponseStream(), System.Text.Encoding.GetEncoding("UTF-8"));
           content = sr.ReadToEnd();
           //save to file
           byte[] b = Convert.FromBase64String("<div>jjjjjjjjjjjjjjjjjjjjjjjjjjjjjj</div>");
           System.IO.MemoryStream ms = new System.IO.MemoryStream(b);
           System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
           img.Save(@"E:\pic.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

           img.Dispose();
           ms.Close();
       }
       catch (Exception ex)
       {
           ex.ToString();
       }