XML : SOAP Reponse contains > and < instead of < and >

I have a problem with xml result when i use "WebRequest". But i can get correct xml format if i use web reference in project. I can't use web reference in my project some limitation. what wrong and what should i do on this. Here is code and result.

  WebRequest request = WebRequest.Create("http://xxx:xx/service.asmx ");  request.Method = "POST";  XmlDocument _xmlDoc = new XmlDocument();  _xmlDoc.Load(_inputPath);  string postData = _xmlDoc.OuterXml;  byte[] byteArray = Encoding.UTF8.GetBytes(postData);  request.ContentType = "text/xml; charset=utf-8";  request.ContentLength = byteArray.Length;  Stream dataStream = request.GetRequestStream();  dataStream.Write(byteArray, 0, byteArray.Length);  dataStream.Close();  WebResponse response = request.GetResponse();  Console.WriteLine(((HttpWebResponse)response).StatusDescription);  dataStream = response.GetResponseStream();  StreamReader reader = new StreamReader(dataStream);  string responseFromServer = reader.ReadToEnd();  Console.WriteLine(responseFromServer);  byte[] buffer = Encoding.UTF8.GetBytes(responseFromServer);  System.Data.DataSet ds = new System.Data.DataSet();  using (System.IO.MemoryStream stream = new System.IO.MemoryStream(buffer))  {      System.Xml.XmlReader _reader = System.Xml.XmlReader.Create(stream);      ds.ReadXml(_reader);      ds.WriteXml(_result);      ds.Dispose();  }    <?xml version="1.0" standalone="yes"?>  <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">    <soap:Body>      <QueryDataSetXMLStringResponse xmlns="sctt.Service">        <QueryDataSetXMLStringResult>&lt;NewDataSet&gt;    &lt;Table&gt;      &lt;GRN_No&gt;GRN-15040089&lt;/GRN_No&gt;      &lt;/NewDataSet&gt;</QueryDataSetXMLStringResult>      </QueryDataSetXMLStringResponse>    </soap:Body>  </soap:Envelope>    **Expected result and get this if i use web refrences**  <?xml version="1.0" standalone="yes"?>  <NewDataSet>    <Table>      <GRN_No>GRN-15040089</GRN_No>        </Table>  </NewDataSet>    Request Env and body  <?xml version="1.0" encoding="utf-8"?>  <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">    <soap:Body>      <QueryDataSetXMLString xmlns="sctt.Service">        <Date>07Jul2015</Date>      </QueryDataSetXMLString>    </soap:Body>  </soap:Envelope>