# Page Not Found

The URL `api/csharp/yarn.compiler.upgrader/yarn.compiler.upgrader.orderedset/yarn.compiler.upgrader.orderedset.isreadonly` does not exist.

You might be looking for one of these pages:
- [OutputFile](https://docs.yarnspinner.dev/api/csharp/yarn.compiler.upgrader/yarn.compiler.upgrader.upgraderesult/yarn.compiler.upgrader.upgraderesult.outputfile.md)
- [Diagnostics](https://docs.yarnspinner.dev/api/csharp/yarn.compiler.upgrader/yarn.compiler.upgrader.upgraderesult/yarn.compiler.upgrader.upgraderesult.diagnostics.md)
- [Files](https://docs.yarnspinner.dev/api/csharp/yarn.compiler.upgrader/yarn.compiler.upgrader.upgraderesult/yarn.compiler.upgrader.upgraderesult.files.md)
- [UpgradeJob(UpgradeType,IEnumerable<CompilationJob.File>)](https://docs.yarnspinner.dev/api/csharp/yarn.compiler.upgrader/yarn.compiler.upgrader.upgradejob/yarn.compiler.upgrader.upgradejob..ctor.md)
- [Version1to2](https://docs.yarnspinner.dev/api/csharp/yarn.compiler.upgrader/yarn.compiler.upgrader.upgradetype/yarn.compiler.upgrader.upgradetype.version1to2.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://docs.yarnspinner.dev/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://docs.yarnspinner.dev/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/api/csharp/yarn.compiler.upgrader/yarn.compiler.upgrader.upgraderesult/yarn.compiler.upgrader.upgraderesult.outputfile.md`)
- Use `Accept: text/markdown` header for content negotiation