Hello,

 I working on Silverlight 2 Beta1 application that reads HTML content from other URL page. I'm experiencing Exception:

System.ArgumentNullException: Value cannot be null.
Parameter name: stream

Here is the code:

try

try

WebResponse response = (WebResponse)request.EndGetResponse(asynchronousResult);

StreamReader streamReader1 = new StreamReader(respStream);

}

However eqvivalent ASP.NET code works well. So it might be access policy problem, but i do have clientaccesspolicy.xml file on server and i can request it from my browser over url: http://localhost/clientaccesspolicy.xml

Here is ASP.NET code:

WebRequest webRequest = WebRequest.Create(url);

Any idea what could be wrong ?

Try this. for this purpose use WebClient is easier:

private void saveURL(string url)

{

  WebClient wc = new WebClient();         
  wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);
  wc.DownloadStringAsync(new Uri(url));

}

void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            if (e.Error == null)
            {
                HtmlPage.Window.Alert(e.Result); //e.Rresult should be the returning string of your page.
            }
        }

If you had cross-domain issue, usually e.Error would say "Download failure." If you did not get an error, but returning string is empty that might be something else.

Software Engineer
Aprimo, Inc

Please remember to mark the replies as answers if they answered your question

Thank you,

Your solution works for my situation. Althought the origial idea is still in question.

 I tried your original code and it works too. I got the same result as using the code I posted. Both should work, just less coding using WebClient.

 You can check asynchronousResult.IsCompleted before you try to get the stream.

Software Engineer
Aprimo, Inc

Please remember to mark the replies as answers if they answered your question