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Extension Blocks in C# 14 Are More Than New Syntax

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Extension methods have been part of C# for years. Extension blocks finally make them feel like a small, organized API. Extension methods are one of those C# features that quietly end up everywhere. LINQ depends on them, library authors use them to improve APIs they do not control, and most production codebases eventually collect a few SomethingExtensions classes. The familiar syntax works, but it starts to feel awkward when several related operations target the same type: public static class DateOnlyExtensions { public static bool IsWeekend(this DateOnly date) => date.DayOfWeek is DayOfWeek.Sa

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