I already tried that but it seems to be not working for me. Firstly got stuck in the pipe section as the opening pipe that way is not supported in windows. Somehow, it's not working for me. Though I have taken the concept of running long process in child thread and implemented it. It's workng absolutely fine but at last while trying to rename the file to the file where I redirected first... it's somewhere not able to access or something like that (not sure) and after waiting for sometime ... getting expired.