Token Registration. Unregister Method
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Disposes of the registration and unregisters the target callback from the associated CancellationToken.
public: bool Unregister();
public bool Unregister ();
member this.Unregister : unit -> bool
Public Function Unregister () As Boolean
true if the method succeeds; otherwise,
Dispose, if the associated callback is currently executing,
Unregister does not wait for it to complete before returning.