# Write

> Writes a single byte.

## Definition

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

## Write(BinaryWriter, byte)

Writes a single byte.

```csharp
public static void Write(this BinaryWriter writer, byte value)
```

### Parameters

**** (\[BinaryWriter]\(/engine/7000.0/script-reference/unity/entities/serialization/binarywriter)): The BinaryReader to write to.**** (\[byte]\(https\://learn.microsoft.com/dotnet/api/system.byte)): The data to write.

## Write(BinaryWriter, int)

Writes a single int.

```csharp
public static void Write(this BinaryWriter writer, int value)
```

### Parameters

**** (\[BinaryWriter]\(/engine/7000.0/script-reference/unity/entities/serialization/binarywriter)): The BinaryReader to write to.**** (\[int]\(https\://learn.microsoft.com/dotnet/api/system.int32)): The data to write.

## Write(BinaryWriter, ulong)

Writes a single ulong.

```csharp
public static void Write(this BinaryWriter writer, ulong value)
```

### Parameters

**** (\[BinaryWriter]\(/engine/7000.0/script-reference/unity/entities/serialization/binarywriter)): The BinaryReader to write to.**** (\[ulong]\(https\://learn.microsoft.com/dotnet/api/system.uint64)): The data to write.

## Write(BinaryWriter, byte\[])

Writes a byte array.

```csharp
public static void Write(this BinaryWriter writer, byte[] bytes)
```

### Parameters

**** (\[BinaryWriter]\(/engine/7000.0/script-reference/unity/entities/serialization/binarywriter)): The BinaryReader to write to.**** (\[byte\[]]\(https\://learn.microsoft.com/dotnet/api/system.byte)): The data to write.