Untitled

<Envelope>
<Body>
<RESULT>
<SUCCESS>true</SUCCESS>
<SESSIONID>dc302149861088513512481</SESSIONID>
<ENCODING>dc302149861088513512481
</ENCODING>
</RESULT>
</Body>
</Envelope>

           reader.Read();
            reader.ReadStartElement("Envelope");
            reader.ReadStartElement("Body");
            reader.ReadStartElement("RESULT");
            reader.ReadStartElement("SUCCESS");
            reader.ReadEndElement();
            reader.ReadStartElement("SESSIONID");
            _sessionID = reader.ReadString();
            reader.ReadEndElement();
            reader.ReadEndElement(); <-- error here
            reader.ReadEndElement();
            reader.ReadEndElement();