Asynchronous programming is an important technique for many modern apps to improve responsiveness. C# 8 debuts Async Streams, which allows an async method return multiple values.

Select C# 8.0 as the language version. Click OK. IAsyncDisposable, IAsyncEnumerable, and IAsyncEnumerator in C# 8.0 Asynchronous streams enable you to consume streams of data asynchronously.

Until C# 8.0, an interface in C# could not contain method definitions. You could only include method declarations in an interface, and the members of an interface were public and abstract by default.

Default interface methods are included in a new feature proposal for C# 8, which will allow developers to use the traits programming technique on the .NET platform.

Q&A Asynchronous and Parallel Programming in C# By David Ramel 05/20/2025 As modern .NET applications grow increasingly reliant on concurrency to deliver responsive, scalable experiences, mastering ...

Microsoft's C# programming language has passed Visual Basic .NET on the TIOBE Index -- which measures language popularity -- and is even in the running for being named "Programming Language of the ...