# Register(VisualElement, in TArg)

> Sets a value for the provided element for this argument identifier. That value can then be retrieved by callbacks that have a second argument of the same type.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine.UIElements](/engine/6000.7/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

## Register(VisualElement, T)

```csharp
public void Register(VisualElement element, in TArg value)
```

### Parameters

**** (\[VisualElement]\(/engine/6000.7/script-reference/unityengine/uielements/visualelement)): The element to set a value for.**** (T): The value that will be used by callbacks on this element for the provided argument.

### Remarks

If a callback is triggered on an element for which the expected argument value has not been set, that callback will be skipped and a warning will be printed.

Additional Resources: [EventArg\<TArg>.Unregister](/engine/6000.7/script-reference/unityengine/uielements/eventarg1/unregister.md)