async wcf service - need to call open() explicitly?

Lame question but when you call a wcf servic开发者_Python百科e asynchronously, do you need to issue a

client.Open() explicitly first or does the async call handle all of that for you?

I am not using a channel factory.

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No you dont have to call open, get yourself the client and call the async method, the framework will handle the rest.