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AJAX (apex:actionFunction) and Controller State?

When an VisualForce AJAX (apex:actionFunction) is invovked does the controller remain in state?


Example: Controller is initialized and an sObject is retrieved and saved on a class variable called "obj" . The actionFunction is invoked, would the sObject still be available in the class variable "obj'? 


I ran some tests and obj is null but I would figure that it would still be set?




Yes, actionfunction causes a postback so the viewstate will be used to maintain the controller state.  I've relied on this many times.


Can you post your code?