CSharp-Coder

Confused about C# interface vs abstract class? Learn the key differences, real code examples, and when to use each. Start writing cleaner C# code today! If you've spent any time writing object-oriented code, you've hit the classic question: C# interface vs abstract class — which one should you use? It's one of the most common C# interview questions and one of the most misunderstood design decisions in real projects. Choosing the wrong abstraction leads to brittle code, painful refactors, and tight coupling. In this tutorial, you'll learn the exact difference between interface and abstract class in C# , see runnable code examples for both, and walk away with a simple decision rule you can apply immediately. What Is an Interface in C#? An interface is a pure contract. It declares what a type can do without saying how it does it. Any class or struct that implements the interface promises to provide an implementation for every member the contract requires. Inter...