# ContentSourceBuildSessionGUID

> For scripts-only or incremental Player builds that reuse an earlier build's content, the BuildReportSummary.BuildSessionGUID of that source build. A default-valued GUID for all other builds.

## Definition

* **Type:** Field
* **Namespace:** [UnityEditor.Build](/engine/6000.6/script-reference/unityeditor/build.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
public GUID ContentSourceBuildSessionGUID
```

### Remarks

This value corresponds to [\_contentSourceBuildSessionGuid](/engine/6000.6/script-reference/unityeditor/build/reporting/buildsummary/contentsourcebuildsessionguid.md). Use it with the [BuildHistory](/engine/6000.6/script-reference/unityeditor/build/buildhistory.md) API to look up the source build and its recorded content information.