Web service notification

[C# Programming]

I'm searching for a nice way to get notification from Web Service. Something like this, I call a method of WS and it register me in someway. Then when some other application calls another method then it should send me any kind of notification. I got exactly what I needed in How to Get Notifications from a .NET Web Service (http://www.codeproject.com/KB/webservices/WebServiceWithEvents.aspx)[^ (http://www.codeproject.com/KB/webservices/WebServiceWithEvents.aspx)]but it can be go worse in some condition. I read about Duplex (http://msdn.microsoft.com/en-us/library/ms731064.aspx)[^ (http://msdn.microsoft.com/en-us/library/ms731064.aspx)] but its WCF. So is there any cool way of doing this...?



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