Upnp/c# Fail send event -

i'm trying build upnp device in c#. have implemented subscriber when try notify variable state change, message didn't listen. test subscription , event, i'm using device spy intel.

here code send notification:

try         {             hostname host = new hostname(hostname);             streamsocket _socket = new streamsocket();              await _socket.connectasync(host, portnumber.tostring());              var html = encoding.utf8.getbytes(message);              datawriter dw = new datawriter(_socket.outputstream);             dw.writestring(message);             await dw.storeasync();          }         catch (exception ex)         {          } 

here send packet:

notify /65088e88-1082-4ac9-98d2-111df151507d/urn:upnp-org:serviceid:acdlserviceid http/1.1 host: 10.10.50.161:58583 content-type: text/xml; charset="utf-8" content-lenght: 126 nt: upnp:event nts: upnp:propchange sid: uuid:8937a19d-bf7b-4903-8875-e5992abe975b seq: 0  <e:propertyset xmlns:e="urn:schemas-upnp-org:event-1-0"><e:property><led_state>acceso</led_state></e:property></e:propertyset> 

what's problem? thank you