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If the exception is thrown on a call to the erload:System.Threading.WaitHandle.WaitAny method, the System.Threading.Mutex returned is the abandoned mutex with the lowest index in the array of System.Threading.WaitHandle objects that was passed to erload:System.Threading.WaitHandle.WaitAny, or null if the abandoned mutex could not be identified. If the exception is thrown on a call to erload:System.Threading.WaitHandle.WaitOne or erload:System.Threading.WaitHandle.WaitAll, this property always returns null.