Vista - Acknowledgement in WCF duplex callback?

I had design a simple WCF duplex callback application. After the client
subscribe to host service, it will receive a callback when there is a event
fired.
If i need an acknowledgement from the client to indicate it success retrieve
and if fail receive then i will re-send the data to the client. Any
possibility to do it in the duplex callback ? if yes, please provide some
sample coding, thanks!

Check here:

http://www.idesign.net/idesign/Deskt...#WCFEssentials

Juval and crew have alot of good WCF examples.




"Elvin" <Elvin@discussions.microsoft.com> wrote in message
news:F803E217-3330-48FE-98ED-CC9FED5CDF36@microsoft.com...
> I had design a simple WCF duplex callback application. After the client
> subscribe to host service, it will receive a callback when there is a
event
> fired.
> If i need an acknowledgement from the client to indicate it success
retrieve
> and if fail receive then i will re-send the data to the client. Any
> possibility to do it in the duplex callback ? if yes, please provide some
> sample coding, thanks!