FileStream.Unlock does not return signaled state

[Bohus]

I want that my thread sleeps until file is unlocked, but
if I wait for signaled state of FileStream handle, it does
not work and ARE.WaitOne() function returns immediately,
even if file is locked by another process.

I have following code :

....

FileStream FS = new FileStream
("\\Logs\\CriticalError.log",FileMode.Append,FileA ccess.Wri
te,FileShare.ReadWrite);
BinaryWriter BW = new BinaryWriter(FS);

try {FS.Lock(0,10);}
catch (IOException E) {
//WaitForSingleObject();
AutoResetEvent ARE = new AutoResetEvent(false);
ARE.Handle=FS.Handle;
ARE.WaitOne();
}

....

FS.Unlock(0,10);
FS.Close();

What sync function should I use that my thread wait until
file is unlocked ?

Thank you very much.