# GrainIdKeyExtensions.CreateIntegerKey(long, ReadOnlySpan<byte>)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.grainidkeyextensions/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.grainidkeyextensions/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/GrainIdKeyExtensions.cs)

```csharp
public static IdSpan CreateIntegerKey(long key, ReadOnlySpan<byte> keyExtension)
```

Creates an [IdSpan](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.idspan/) representing a `System.Int64` key and key extension string.

### Parameters

- `key` (`long`): The key.
- `keyExtension` (`ReadOnlySpan<byte>`): The UTF-8 encoded key extension.

### Returns

An [IdSpan](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.idspan/) representing the provided key and key extension.