Charp (C#):validate http links

  public bool ImageExists(string url) {
        Uri urlCheck = new Uri(url);

        WebRequest request = WebRequest.Create(urlCheck);
        request.Credentials = CredentialCache.DefaultCredentials;

        request.Timeout = 15000;

        WebResponse response;
        try {
            //get URL web response
            response = request.GetResponse();
            return true;
        }
        catch (Exception){
            return false; //url does not exist
        }
    }