asyncronous httphandler web request

asyncronous-web-request.ashx.cs

 public class RequestState
    {
        public WebRequest Wr { get; set; }
        public HttpContext Cxt { get; set; }
        public static string ReadStream(Stream i)
        {
            using (StreamReader sr = new StreamReader(i))
            {
                return sr.ReadToEnd();
            }
        }
    }
    public class async_webrequest_test : IHttpAsyncHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            throw new NotImplementedException();
        }

        public bool IsReusable
        {
            get
            {
                return true;
            }
        }

        public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
        {
            var r = new RequestState()
            {
                Wr = WebRequest.Create("http://www.google.com"),
                Cxt = context
            };
            r.Wr.Method = "GET";
            return r.Wr.BeginGetResponse(cb, r);
        }

        public void EndProcessRequest(IAsyncResult result)
        {
            var r = (RequestState)result.AsyncState;
            var s=r.Wr.EndGetResponse(result);
            r.Cxt.Response.ContentType = "text/plain";
            r.Cxt.Response.Write(string.Format("Hello World async {0}",RequestState.ReadStream( s.GetResponseStream())));
        }

        
    }

retested with isreusable=true