🧭 C# – Features

Feature	Introduced in	Status	Group	Link
String interpolation	C# 6	Stable	Language fundamentals	Guide
nameof	C# 6	Stable	Language fundamentals	Guide
Null-coalescing (??)	C# 2	Stable	Language fundamentals	Guide
Null-conditional (?.)	C# 6	Stable	Language fundamentals	Guide
var (implicit typing)	C# 3	Stable	Language fundamentals	Guide
Anonymous types	C# 3	Stable	Language fundamentals	Guide
Dynamic	C# 4	Stable	Language fundamentals	Guide
Top-level statements	C# 9	Stable	Language fundamentals	Guide
File-scoped namespaces	C# 10	Stable	Language fundamentals	Guide
Raw string literals	C# 11	Stable	Language fundamentals	Guide
Collection expressions	C# 12	Stable	Language fundamentals	Guide
Break vs Continue	—	Stable	Control flow	Guide
Switch expressions	C# 8	Stable	Control flow	Guide
Pattern matching – Basic	C# 7	Stable	Pattern matching & records	Guide
Pattern matching – Advanced	C# 9–12	Stable	Pattern matching & records	Guide
Records	C# 9	Stable	Pattern matching & records	Guide
Tuples	C# 7	Stable	Language fundamentals	Guide
Deconstruction	C# 7	Stable	Language fundamentals	Guide
Extension methods	C# 3	Stable	Object-oriented	Guide
Auto-implemented properties	C# 3	Stable	Properties & events	Guide
Expression-bodied members	C# 6	Stable	Object-oriented	Guide
Indexers	C# 1	Stable	Properties & events	Guide
Init-only setters	C# 9	Stable	Properties & events	Guide
Required members	C# 11	Stable	Properties & events	Guide
Global usings	C# 10	Stable	Source generation & modern C#	Guide
Primary constructors	C# 12	Stable	Source generation & modern C#	Guide
async/await	C# 5	Stable	Async & parallel	Guide
Lambda expressions	C# 3	Stable	Generics & LINQ	Guide
LINQ query expressions	C# 3	Stable	Generics & LINQ	Guide
IEnumerable vs IQueryable	.NET 3.5	Stable	Generics & LINQ	Guide
Iterator (yield)	C# 2	Stable	Generics & LINQ	Guide
`Span<T>` & ref structs	C# 7.2+	Stable	Async & parallel	Guide
unsafe & fixed	C# 1	Advanced	Language fundamentals	Guide
Lazy properties	Custom	Stable	Properties & events	Guide
Validated properties	Custom	Stable	Properties & events	Guide
Computed properties	Custom	Stable	Properties & events	Guide