Methods for implementing asynchronous GET in C#

using System;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
namespace WebClientAsynProject
{
  public class Program
  {
    #region HttpWebRequest Asynchronous GET    public static void AsyncGetWithWebRequest(string url)
    {
      var request = (HttpWebRequest) (new Uri(url));
      (new AsyncCallback(ReadCallback), request);
    }
    private static void ReadCallback(IAsyncResult asynchronousResult)
    {
      var request = (HttpWebRequest) ;
      var response = (HttpWebResponse) (asynchronousResult);
      using (var streamReader = new StreamReader(()))
      {
        var resultString = ();
        (resultString);
      }
    }
    #endregion
    #region WebClientAsync GET    public static void AsyncGetWithWebClient(string url)
    {
      var webClient = new WebClient();
       += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
      (new Uri(url));
    }
    private static void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
      //();
      ( != null ? "An error occurred with WebClient asynchronous GET!" : );
    }
    #endregion
    #region WebClient's OpenReadAsync test    public static void TestGetWebResponseAsync(string url)
    {
      var webClient = new WebClient();
       += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
      (new Uri(url));
    }
    private static void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
    {
      if( == null)
      {
        var streamReader = new StreamReader();
        var result = ();
        (result);
      }
      else
      {
        ("An error occurred when executing OpenReadAsync for WebClient:" + );
      }
    }
    #endregion
    public static void Main(string[] args)
    {
      AsyncGetWithWebRequest("");
      ("hello");
      AsyncGetWithWebClient("");
      ("world");
      TestGetWebResponseAsync("");
      ("jxqlovejava");
      ();
    }
  }
}