SOLID Principles with C#

Originally published at https://allcoderthings.com/en/article/csharp-solid-principles In software development, the SOLID principles, defined by Robert C. Martin, are five fundamental guidelines aimed at creating more flexible, readable, and maintainable systems in object-oriented programming (OOP). In C#, these principles are widely applied as guiding rules in class design. 1. Single Responsibility Principle (SRP) A class should have only one responsibility . In other words, it should have only one reason to change. If a class performs multiple tasks (e.g., saving data + generating reports), it becomes harder to maintain and more prone to errors. // Wrong: Handles both saving orders and printing invoices public class OrderManager { public void SaveOrder ( Order order ) { /* save */ } public void PrintInvoice ( Order order ) { /* print */ } } // Correct: Each class has a single responsibility public class OrderRepository { public void Save ( Order order ) { /* save */ } } public class I