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    <p>Let me start by double-checking that I understand the question. If you run something like the below snippet, you expect it to fail eventually, right?</p> <pre><code>while (true) { System.IO.Directory.CreateDirectory( ".\\FooDir" ); System.IO.Directory.Delete( ".\\FooDir" ); } </code></pre> <p>If your application is the only thing running on the system that has a handle open to that file, then this <em>feels</em> like a bug. So knowing the OS version would help. </p> <p>On the other hand, if there is something else in the system that is keeping the handle open for just a little while, then whether this is a bug or not becomes a little more fuzzy. The number of things that try to blindly grok files and directories might surprise you. A naive indexer, for example, might be walking into that directory, enumerating it, looking for files to index and so on -- and if you collide with him, blammo. A similarly naive anti-virus filter, or some other file system filter, might be poking it as well (in this case, it still feels like a bug).</p> <p>There are little things we've done in the OS to try and give services like these ways to get out of your way. Does it repro if you turn the indexer off, if you turn off any anti-virus, any anti-malware? We can go from there, and hopefully we will find that newer bits have it fixed already (that statement had a lot of assumptions in it, I know).</p> <p>One other relatively interesting piece of trivia is that ERROR_ACCESS_DENIED is a Win32 error that is mapped from more than one underlying status in the system (see <a href="http://support.microsoft.com/kb/113996" rel="nofollow noreferrer">this article</a> for example). So if we can dig a little deeper, we may be able to find out what the file system is trying to tell the app (if it's more than access denied).</p> <p>We might end up getting into a conversation about whether you can, in the wild, assume that your app is the only thing poking at your files and directories. You can probably guess where that one will go.</p>
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    1. POWhat causes CreateDirectory to return ERROR_ACCESS_DENIED?
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    1. COYour loop is an essentially correct restatement of P2 except that [a] P2 makes Win32 calls in C++ rather than what I assume is C# at the .NET level and [b] P2 collects statistics about how long CreateDirectory succeeds/fails and which GetLastError value was produced
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    2. COPart of the problem at the moment is reproducing this problem, which is why I've asked what might cause it. When I originally became aware of it, it was happening once in three runs of the program I actually care about (as opposed to my test tool). Foolishly, I rebooted, and, since then, it's been very difficult to reproduce, even though I haven't changed my configuration. In other words, if indexing were the issue, it's still turned on, and I still can't repro the problem.
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    3. CONeedless to say, I would be very interested to know which NT error got mapped onto ERROR_ACCESS_DENIED. But I'll read the list and see if my imagination comes up with anything.
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