# C# 15: Two features for library authors

Two C# 15 features for library authors on one page: static interface members on older runtimes, and the memory safety preview. From the blog post \[What's new in C# 15: Two features for library authors\](/blog/whats-new-in-csharp-15-for-library-authors).

![The cheat sheet C# 15: Two features for library authors, with Codey: the three points of the post on one page](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/5736fda94db546148a46e692c6e79b30.webp)

- Category: C#
- Level: Apprentice
- Tags: csharp, csharp-15, whats-new
- Updated: November 11, 2026

Source: https://www.ask-codey.com/cheat-sheets/csharp-15-for-library-authors-cheat-sheet