Classes, Enums, and Records Look Like Simple Language Features — Until You Realize They Define Your Entire Domain Model Why Senior .NET Engineers Spend More Time Designing Data Than Writing Business Logic Most developers begin learning C## by creating variables. string name = "Laptop" ; decimal price = 999.99M ; int quantity = 5 ; At first, this feels perfectly reasonable. The application works. The compiler is happy. Nothing appears wrong. Then the system grows. Suddenly you have: Product names