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With traditional ASMX web services synchronous request, the client connects, makes a request and waits for the entire message body to be returned.
I was wondering if its possible to have chunks of data flushed back to the client instead with WCF?
This way I can display some progress to the client app during the operation.
Using WCF you can either use streaming or duplex messages to achieve that. Using streaming you are restricted to returning a single stream object. using duplex duplex messaging you pass a callback channel to the server and it can use that channel to make as many calls as you like to the client.