public XmlDocument SendCloseRpc()
{
var rpc = new XmlDocument();
rpc.LoadXml("<?xml version=\"1.0\" encoding=\"UTF-8\"?><rpc message-id=\"6666\" xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><close-session/></rpc>");
return _netConfSession.SendReceiveRpc(rpc, AutomaticMessageIdHandling);
}