AsyncAccess

gistfile1.cs

public class AsyncAccess
{

    public IObservable<string> requestHttpGET(string url)
    {
        var request = WebRequest.Create(url);
        return Observable.FromAsyncPattern<WebResponse>(
            request.BeginGetResponse, request.EndGetResponse)
            .Invoke()
            .Select(resp =>
            {
                using (var stream = resp.GetResponseStream())
                using (var st = new StreamReader(stream))
                {
                    return st.ReadToEnd();
                }
            }).ObserveOnDispatcher()
            .Select(content =>
            {
                return content;
            });
    }
}