CSharp-Coder

Learn all C# 13 new features with runnable code examples — params collections, the Lock type, partial properties and more. Master C# 13 today. C# 13 shipped alongside .NET 9, and by 2026 it has become the version most production teams are writing every day. If you're searching for C# 13 new features , this guide walks through every major addition — params collections, the new System.Threading.Lock type, partial properties, implicit index access, and more — with runnable code examples and, just as importantly, an explanation of why each feature exists and when you should reach for it. Whether you're a beginner wondering how to use the new syntax, an intermediate developer looking for best practices, or a senior engineer evaluating advanced ref struct capabilities, there's something here for you. Let's dig in. What's New in C# 13? A Quick Overview Here's the full list of C# 13 new features at a glance: params collections — params now works wit...