# MemoryBinaryWriter(EntityManager, string)

> Creates an empty writer.

## Definition

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

```csharp
public MemoryBinaryWriter(EntityManager entityManager = default, string imHexName = null)
```

### Parameters

**** (\[EntityManager]\(/engine/7000.0/script-reference/unity/entities/entitymanager)): The entity manager whose types an editor ImHex pattern describes, if ImHex output is enabled.**** (\[string]\(https\://learn.microsoft.com/dotnet/api/system.string)): The name of the ImHex pattern file, if ImHex output is enabled.