---
title: Usings
description: Controls whether Curb sorts System.* directives before all others, inserts blank lines between using groups, and moves using directives inside or outside...
url: https://docs-v3-preview.elastic.dev/reference/usings
---

# Usings
Controls whether Curb sorts `System.*` directives before all others, inserts blank lines between using groups, and moves `using` directives inside or outside the namespace declaration. IDE0065.
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