C# Error CS8400 – Feature ‘{0}’ is not available in C# 8.0. Please use language version {1} or greater.

C# Error

CS8400 – Feature ‘{0}’ is not available in C# 8.0. Please use language version {1} or greater.

Reason for the Error & Solution

Feature ‘feature’ is not available in C# 8.0. Please use language version <version> or greater.

To correct this error

Upgrade your project to at least the version mentioned in the error.