# IsValid

> Whether this key carries an address.

## Definition

* **Type:** Property
* **Namespace:** [Unity.Localization.Providers](/engine/6000.7/script-reference/unity/localization/providers.md)
* **Assembly:** UnityEngine.LocalizationRuntimeModule

```csharp
public bool IsValid { get; }
```

### Remarks

A key built from an empty or null address is invalid, and providers resolve it to `null`.