Hello, I found an example for async ftp upload on msdn which does the following (snippet):

        // Asynchronously get the stream for the file contents.
        request.BeginGetRequestStream(
            new AsyncCallback (EndGetStreamCallback), 
            state
        );

        // Block the current thread until all operations are complete.
        waitObject.WaitOne();

The thing what I do not understand here is, which sense does asynchronous IO make if the thread is blocked anyway with an explicit waithandle. I always thought the advantage of asynchronous IO was that the user/programm does not have to wait.