# ReadULong(BinaryReader)

> Reads a single ulong.

## Definition

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

```csharp
public static ulong ReadULong(this BinaryReader reader)
```

### Parameters

**** (\[BinaryReader]\(/engine/7000.0/script-reference/unity/entities/serialization/binaryreader)): The BinaryReader to read from.

### Returns

| Type                                                          | Description    |
| ------------------------------------------------------------- | -------------- |
| [ulong](https://learn.microsoft.com/dotnet/api/system.uint64) | The read data. |