Use this property only when you must wait on a SemaphoreSlim together with other kernel-based synchronization objects with the same wait handle. A successful wait on the SemaphoreSlim.AvailableWaitHandle does not imply a successful wait on the System.Threading.SemaphoreSlim itself, nor does it decrement the semaphore's count. After the available wait handle is signaled, you should wait on the System.Threading.SemaphoreSlim specifically.