MemoizR is a .NET library inspired by frontend reactive patterns (like React Hooks and Angular Signals) that brings declarative structured concurrency to C#. It features dynamic lazy memoization and dependency graph tracking to avoid unnecessary recomputations across multiple threads. A walkthrough of a simple console app demonstrates how the library selectively re-evaluates only the parts of the dependency graph affected by value changes, covering four scenarios: initial run, changing one value, changing another, and changing nothing.
