# Sandbox.ICompileReferenceProvider.Lookup

```csharp
Microsoft.CodeAnalysis.PortableExecutableReference Lookup(string reference)
```

Find a reference for this dll

### Parameters

- `reference` (`string`)

### Returns

`Microsoft.CodeAnalysis.PortableExecutableReference`

Declared in [Sandbox.ICompileReferenceProvider](/api/Sandbox.ICompileReferenceProvider).
Assembly: `Sandbox.Compiling`.