Downloading a PDF File from a URL

Good Day All

i have a Reporting Service URL that i dynamically pass the Parameters on a Querystrng and if i take that URL and post it on a BRowser it downloads the PDF file. so i want to do this in C# , this code runs in a WCF service

        public void GetAccountEmailStatement(string AccountNumber, string EmailAddress)
        { 
            try
            {
                //  
                
                string remoteUri = "http://myserver/ReportServer/Pages/ReportViewer.aspx?%2fE-Billing%2fISU_PDF_GEN_1&rs:Command=Render&Contract_Account_Number=" + AccountNumber + "&Post_Date=26/02/15&rs:Format=PDF";
                string fileName = HttpContext.Current.Server.MapPath("/Temp/"  + AccountNumber + ".pdf");  
                WebClient webClient = new WebClient();
                webClient.DownloadFile(remoteUri, fileName); //Error hapeens on this line
 
            }
            catch (SqlException ex)
            {
                throw ex;
            }
            finally
            {
                this.con.Close();
            } 
        }

The Error i get when its supposed to download the file is


[COLOR="#FF0000"]The remote server returned an error: (401) Unauthorized.[/COLOR]

Please help

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