# b

> Use same as a field.

## Definition

* **Type:** Property
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

> **Warning:**
>
> **Removed.** 'b' is obsolete, please use 'FullNamespaceId' and 'Serial' instead.

```csharp
public ulong b { get; set; }
```