# Sandbox.Particle.BaseListener.OnUpdate

```csharp
void OnUpdate(Particle p, float dt)
```

Called in a thread, guarenteed to be called after OnEnabled

### Parameters

- `p` (`Particle`)
- `dt` (`float`)

Declared in [Sandbox.Particle.BaseListener](/api/Sandbox.Particle.BaseListener).
Assembly: `Sandbox.Engine`.