problem in UPNP port

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hi every one
I add this UPNP port by c#

NATUPNPLib.UPnPNATClass upnpnat = new NATUPNPLib.UPnPNATClass();
         NATUPNPLib.IStaticPortMappingCollection mappings = upnpnat.StaticPortMappingCollection;
         //mappings.Remove(9603, "TCP");
         //mappings.Remove(9603, "UDP");

         mappings.Add(9604, "TCP", 9604, "192.168.1.199", true, "dri");
         mappings.Add(9604, "UDP", 9604, "192.168.1.199", true, "dri");

and when test port is open from http://www.yougetsignal.com/tools/open-ports/[^]
or any apps give me

Port 9604 is closed

so how I can open this port by code any code
thanks for any help