How to Fixed: Feature ‘raw string literals’ is not available. Please use language version 11.0 or greater

When I copy code from mslearn. VSCode tell me the error

Feature ‘raw string literals’ is not available. Please use language version 11.0 or greater.

How to Fix

• Install .NET 7 or above.
• Change csproj file <TargetFramework> to net7.0 or above
• Rebuild and test ^__^