C# 9.0 adds the accompanying highlights and improvements to the C# language:
| Sl.No | Details |
| 1 | Records |
| 2 | Target-typed new expressions |
| 3 | Init only setters |
| 4 | Pattern matching enhancements |
| 5 | Top-level statements |
| 6 | Native sized integers |
| 7 | Suppress emitting localsinit flag |
| 8 | Function pointers |
| 9 | Static anonymous functions |
| 10 | Target-typed conditional expressions |
| 11 | Extension GetEnumerator support for foreach loops |
| 12 | Covariant return types |
| 13 | New features for partial methods |
| 14 | Lambda discard parameters |
| 15 | Module initializers |
| 16 | Attributes on local functions |