foreach (string url in list)
            {
                    DownloadShopImg img = new DownloadShopImg(url);
                
            }

public DownloadShopImg(string url)
        {
                webBrowser1 = new WebBrowser();
                webBrowser1.Url = new Uri(url);
                webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
        }

 void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
}