No, file streams do not support multiple concurrent IOs. The Windows file system does not handle that well. It will almost certainly throw an exception.

No, file streams do not support multiple concurrent IOs. The Windows file system does not handle that well. It will almost certainly throw an exception.

Edit:

Synchronization and Overlapped Input and Output seems to indicate that the file system will correctly handle multiple overlapped IO requests. My bad.

Do not, however, try to do concurrent synchronous writes on a FileStream. That throws an exception.