Exception thrown in a lock c#2

I've a strance behaviour with C#2, an exception is thrown will calling a lock(...). I have the following exception : System.Threading.ThreadAbortException: Thread was being aborted. at System.Threading.Monitor.Enter(Object obj)...

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Have you seen that kind of exception ? TIA

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This exception is being thrown because your thread is being aborted.

Threads can be aborted in one of several situations: another thread calls Thread.Abort, an AppDomain is being unloaded, or an ASP.NET application is being recycled.