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    <p>Intuitive, maybe, but the reason those examples lock on a private field is to ensure that no other piece of code in the application can take the same lock in such a way as to deadlock the application, which is always good defensive practice.</p> <p>If it's a small application and you're the only programmer working on it, you can probably get away with locking on a public field/property (which I presume AppSetting.Instance is?), but in any other circumstances, I'd strongly recommend that you go the private field route. It <strong>will</strong> save you a whole lot of debugging time in the future when someone else, or you in the future having forgotten the implementation details of this bit, take a lock on AppSetting.Instance somewhere distant in the code and everything starts crashing.</p> <p>I'd also suggest you lose the outermost if. Taking a lock isn't free, sure, but it's a lot faster than doing a string comparison, especially since you need to do it a second time inside the lock anyway.</p> <p>So, something like:</p> <pre><code>private object _instanceLock = new object () ; private static void ValidateEncryptionKey() { lock (AppSetting.Instance._instanceLock) { if (AppSetting.Instance.EncryptionKey.Equals(Constants.ENCRYPTION_KEY, StringComparison.Ordinal)) { AppSetting.Instance.EncryptionKey = GenerateNewEncryptionKey(); AppSetting.Instance.Save(); } } } </code></pre> <p>An additional refinement, depending on what your requirements are to keep the EncryptionKey consistent with the rest of the state in AppSetting.Instance, would be to use a separate private lock object for the EncryptionKey and any related fields, rather than locking the entire instance every time.</p>
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    1. COExcellent feedback - this is just the kind of info I was looking for. Thanks!
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