---
title: CRARCH0009 Use string interpolation
---

- **Category:** Architecture
- **Default severity:** Warning
- **Diagnostic ID:** `CRARCH0009`

## What it checks

Interpolated strings are clearer and easier to maintain.

## Diagnostic message

`Use string interpolation instead of string.Format or concatenation`

## How to resolve

Replace `string.Format` and string concatenation with interpolated strings.