static void AsynchronousPattern()
{
    WebRequest request = WebRequest.Create(url);
    IAsyncResult result = request.BeginGetResponse(ar =>
    {
        using (WebResponse response = request.EndGetResponse(ar))
        {
            Stream stream = response.GetResponseStream();
            var reader = new StreamReader(stream);

            string content = reader.ReadToEnd();
            Console.WriteLine(content.Substring(0, 100));
            Console.WriteLine();
        }
    }, null);
}