C# has evolved rapidly, with five major language releases in the last five years (C# 10-14), making it challenging to stay current. This session provides a focused refresh of the most impactful features every .NET developer should be using today, including collection expressions, primary constructors, raw string literals, required members, file-scoped namespaces, global usings, pattern-matching enhancements, params collections, the new lock object, and more. We will also explore recent .NET advancements, including Native AOT compilation and key runtime enhancements. Whether you're modernizing legacy code or catching up after time away from .NET, you'll leave with a practical roadmap of features to adopt immediately and an understanding of which improvements deliver the most value. Expect live code demonstrations and before/after comparisons that make the benefits crystal clear.