unable to download file using HttpWebRequest in c#

using a webservice i am trying to download files (*.doc, *.rtf , *.txt etc) but getting the following exception


.GetResponseStream().Length' threw an exception of type 'System.NotSupportedException' long {System.NotSupportedException}

'httpResponse.GetResponseStream().Position' threw an exception of type 'System.NotSupportedException' long {System.NotSupportedException}

{"This stream does not support seek operations."} System.SystemException {System.NotSupportedException}

the code i m using is

HttpWebRequest fileReq = (HttpWebRequest)HttpWebRequest.Create("http://member.goodpractice.net/content.htm" + queryString);

            //Create a response for this request
            HttpWebResponse fileResp = (HttpWebResponse)fileReq.GetResponse();

            if (fileResp.ContentLength > 0)
            {
                //fileResp.ContentLength = fileResp.ContentLength;

                //Get the Stream returned from the response
                Stream stream = fileResp.GetResponseStream();
            }

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The absolute url e.g. (http://member.goodpractice.net/content.htm?GWSUsername=xxx&GWSPassword=xxx&format=4&id=582805c7-6386-0029-b068-9fe900b4c257) works perfectly fine when opened in a browser it would download the file  without any issues. Any ideas what could be wrong with this code