C# 9.0

.NET 5.0 introduced in Visual Studio 2019.

link - learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9

Record types
Positional syntax for property definition
Immutability
Value equality
Nondestructive mutation
Built-in formatting for display
Inheritance
Init only setters
Top-level statements
Pattern matching enhancements
Performance and interop
Fit and finish features
Support for code generators

Record types
Positional syntax for property definition
Immutability
Value equality
Nondestructive mutation
Built-in formatting for display
Inheritance
Init only setters
Top-level statements
Pattern matching enhancements
Performance and interop
Fit and finish features
Support for code generators

You use the record keyword to define a reference type that provides built-in functionality for encapsulating data.

public record Person(string FirstName, string LastName);