'How to Trigger an Event using VFX Graph

I'm beginner level with Visual Effects Graph on Unity. I want to be able to toggle on and off a VFX, but I'm having difficulty understanding how to trigger that to happen ( and cannot find documentation on this )

Screenshot of current VFX Graph

I understand pressing 'spacebar' creates an Event and Event name ( OnPlay by default ) but how do I utilize this feature in C#?

Any help will be greatly appreciated. Even pointing me to correct documentation.



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