How to Design a Reusable C# Library

Transforming working code into a reusable library requires deliberate design decisions. Key steps include choosing descriptive names, ensuring API consistency, introducing clear concepts (like repository patterns), creating abstractions to hide implementation details, and organizing code with nested namespaces. The tutorial demonstrates refactoring EF Core code for immutable entities, showing how to evolve from inconsistent extension methods to a clean, interface-based library with intuitive method names and minimal surface area.