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Okay, I just can't get my head around multi-threading scenarios properly. Sorry for asking a similar question again, I'm just seeing many different "facts" around the internet. public static class MyClass { private static List<string> _myList = new List<string>; private static bool _record; public static void StartRecording() { _myList.Clear(); _record = true; } public static IEnumerable<string> StopRecording() { _record = false; // Return a Read-Only copy of the list data var result = new List<string>(_myList).AsReadOnly(); _myList.Clear(); return result; } public static void DoSomething() { if(_record) _myList.Add("Test"); // More, but unrelated actions } } The idea is that if Recording is activated, calls to DoSomething() get recorded in an internal List, and returned when StopRecording() is called. My specification is this: StartRecording is not considered Thread-Safe. The user should call this while no other Thread is calling DoSomething(). But if it somehow could be, that would be great. StopRecording is also not officially thread-safe. Again, it would be great if it could be, but that is not a requirement. DoSomething has to be thread-safe The usual way seems to be: public static void DoSomething() { object _lock = new object(); lock(_lock){ if(_record) _myList.Add("Test"); } // More, but unrelated actions } Alternatively, declaring a static variable: private static object _lock; public static void DoSomething() { lock(_lock){ if(_record) _myList.Add("Test"); } // More, but unrelated actions } However, <a href="https://stackoverflow.com/questions/230716/

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