How to Download image from Url For Web Scraping

/// <summary> /// Function to download Image from Url
 /// </summary>
 /// URL address to download image
 /// <returns>Image</returns> 
 private Image DownloadImage(string _URL)
 {
        Image _tmpImage = null;
        Application.DoEvents();
        try
        {
                    // Open a connection
                    System.Net.HttpWebRequest _HttpWebRequest = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(_URL);
                    _HttpWebRequest.AllowWriteStreamBuffering = true; 
                    // You can also specify additional header values like the user agent or the referer: (Optional)
                    _HttpWebRequest.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6b) Gecko/20031212 Firebird/0.7+";
                    _HttpWebRequest.Referer = "http://www.google.com/";
                     // set timeout for 20 seconds (Optional)
                    _HttpWebRequest.Timeout = 20000;

                     // Request response:
                     System.Net.WebResponse _WebResponse = _HttpWebRequest.GetResponse();

                     // Open data stream:
                     System.IO.Stream _WebStream = _WebResponse.GetResponseStream();

                     // convert webstream to image
                     _tmpImage = Image.FromStream(_WebStream);

                     // Cleanup
                     _WebResponse.Close();
                     _WebResponse.Close();
            }
            catch (Exception _Exception)
            {
                     // Error
                     Console.WriteLine("Exception caught in process: {0}", _Exception.ToString());
                     return null;
             }
            return _tmpImage;
 }