Software⏱️ 2 min read📅 2026-06-03

How to Fix: Feature 'using declarations' is not available in C# 7.3. Please use language version 8.0 or greater - Error on one machine but works on another

Error in C# 7.3 using declarations feature.

Quick Answer: Check Visual Studio version and update to 16.4 or later, as the 'using declarations' feature is available in C# 8.0.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

The error 'Feature 'using declarations' is not available in C# 7.3. Please use language version 8.0 or greater' can be resolved by ensuring that the Visual Studio Enterprise edition is updated to the latest service pack and language features are enabled.

🛑 Root Causes of the Error

  • Visual Studio Enterprise edition is outdated or not updated to the latest service pack.

🔧 Proven Troubleshooting Steps

Method 1: Update Visual Studio

  1. Step 1: Open the Visual Studio settings by pressing Ctrl + , and navigate to Tools > Options.
  2. Step 2: In the Options window, click on Products & Features and select the C# option.
  3. Step 3: Click on the Update button to check for available updates and install the latest service pack.

Method 2: Enable Language Features

  1. Step 1: Open the Visual Studio settings by pressing Ctrl + , and navigate to Tools > Options.
  2. Step 2: In the Options window, click on Text Editor > C# > Advanced.
  3. Step 3: Check if the Language Features option is enabled and toggle it to On if necessary.

🎯 Final Words

By following these steps, you should be able to resolve the error and start using using declarations in your C# projects.

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