Gets or sets the handle to the synchronization event that is signaled when the I/O operation is complete.
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To get the handle of a managed synchronization object that derives from the System.Threading.WaitHandle class, use the WaitHandle.SafeWaitHandle property to get a Microsoft.Win32.SafeHandles.SafeWaitHandle object, and then call the System.Runtime.InteropServices.SafeHandle.DangerousGetHandle method.