Here's a summary of what's new in C# in this preview release:
C# 14 updates:
- What's new in C# 14 documentation
- Breaking changes in C# 14
C# 14 rounds out the set of partial members by adding partial instance constructors and partial events. These new partial member types join partial methods and partial properties that were added in C# 13. Partial members allow one part of a class to declare a member, which can then be implemented in another part of the same class, often in a different file. Partial members are often used by source generators.