How can a Deserialize a WCF response

Uri uri = host.StartsWith("http:")
                          ? new Uri(host)
                          : new UriBuilder("http://", host, 80, "servername").Uri;


            var request = WebRequest.Create(uri);
            request.ContentType = "application/soap+xml; charset=utf-8";
            request.Method = "POST";
            using (var stream = request.GetRequestStream())
            {
                stream.Write(Encoding.UTF8.GetBytes(xml), 0, xml.Length);
            }
#if true
            try
            {
                using (var response = request.GetResponse() as HttpWebResponse)
                using (var responseStream = response.GetResponseStream())
                using (var sr = new StreamReader(responseStream))
                {
                    return sr.ReadToEnd();
                }

            }
            catch (Exception ex)
            {
                return String.Format("<exception>{0}<stacktrace>{1}</stacktrace></exception>", ex.Message, ex.StackTrace);
            }