C# ADDS UNION TYPES IN .NET 11 PREVIEW 2

Union types enable developers to explicitly declare that a value can be one of multiple specific types, improving type safety and reducing reliance on null checks or object casting. The feature works through discriminated unions, where each type option is clearly defined. This approach has proven valuable in languages like TypeScript, Rust, and F#, where it helps catch errors at compile time rather than runtime. Developers can now write more expressive code by using union types in method signatures and variable declarations. The compiler ensures values are handled according to their actual type, eliminating entire categories of bugs. The implementation in C# brings the language closer to modern functional programming patterns while maintaining backward compatibility. The feature appears in .NET 11 Preview 2, with general availability expected later in the release cycle.