Use of lock keyword and the new async functionality of C# 5.0

Is it still necessary to use the lock keyword on resources like SQL Compact database in methods called with async (AsyncC开发者_开发知识库tpLibrary.dll)? As i understand from the talk given by Anders, the async processing all happens within the same thread, so they shouldn't be a need for it, or am I wrong? I cannot find any info on this anywhere on the internet at the moment.

Thanks

AFAIK async is based on the TPL and Tasks - and so no they won't be running on the same thread every time (or continue on the same thread) and yes you have to design with concurency in mind still. Async only helps you to put the pieces together in a much nicer way.

To be clear: everything inside your methods (if started only once) will run in a thread at a time but if you share resources you will have to think on locking or other synchronization methods just as you used to do all the time.

If you can go for immutable data - this way you can strip all this to a mere minimum, but you allway have to remember that your processes will run on many threads (dispatch for UI comes to mind).