I have a VF page to create the cases and to insert the attachments to case.On Changing the picklist values i have to rerender the entire page to enter new values. But I have a inputfile tag in the VF page which doesn't support rerender. How to resolve it?
Rerendering is not supported when you have an apex:inputFile component. There's no workaround, as the platform simply will not allow it. The best you can do is to move the apex:inputFile into an apex:iframe which will leave the rest of the "page" alone.
BTW If you are looking to rerender the entire page, that sounds the same as a refresh.
You can also go for
apex:actionRegion from here