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POWhat is the difference between locking the specified object and locking a secondary object?
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copied!<p>I was recently asked by a friend of mine who's just starting to play around with threading what the difference between using a secondary object purely for the purpose of locking or just locking the object you're referencing is. I had to admit that I had no idea, can anyone tell me? I will try and demonstrate with a couple of code snippets:</p> <p>First method:</p> <pre><code>List<string> data = new List<string>(); object datalock = new object(); void main() { lock(datalock) { if (data.contains("SomeSearchString")) { //Do something with the data and then remove it } } } </code></pre> <p>Second method:</p> <pre><code>List<string> data = new List<string>(); void main() { lock(data) { if (data.contains("SomeSearchString")) { //Do something with the data and then remove it } } } </code></pre> <p>Is there a significant difference or is this down to personal coding style? If there is a significant difference, can anyone explain what it is?</p> <p>I did come across another question [<a href="https://stackoverflow.com/questions/230716/difference-between-locklocker-and-lockvariablewhichiamusing">Difference between lock(locker) and lock(variable_which_I_am_using)</a>] in which the answer implied that both of these are equivalent, but if that's the case, which would be the best to use and why?</p> <p>I've seen a number of examples scattered around the net, I tend to use the first method as a matter of personal choice, but I wondered what the merits of using the second method would be.</p>

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