> For the complete documentation index, see [llms.txt](https://docs.yarnspinner.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yarnspinner.dev/2.4/api/csharp/yarn.compiler/yarn.compiler.basicblock/yarn.compiler.basicblock.firstinstructionindex.md).

# FirstInstructionIndex

Property in [BasicBlock](/2.4/api/csharp/yarn.compiler/yarn.compiler.basicblock.md)

## Summary

Gets the index of the first instruction of the node that this block is in.

```csharp
public int FirstInstructionIndex { get; set; }
```