public void LoadImageFromUrl(ref string url, PictureBox pb)
{
    HttpWebRequest request = (HttpWebRequest)Net.HttpWebRequest.Create(url);
    HttpWebResponse response = (HttpWebResponse)request.GetResponse;
    Image img = Image.FromStream(response.GetResponseStream());
    response.Close();
    pb.SizeMode = PictureBoxSizeMode.StretchImage;
    pb.Image = img;
}