First Round(Technical): 1. Difference between abstraction and encapsulation. Give some example. 2. Singleton Design Pattern? how to create a thread safe singleton class? How to improve the performance of thread safe singleton class if multiple threads(let say 10 different threads) try to access the object at same time. 3. Different Types of polymorphism with real life examples. 4. SOLID Design principle with examples. 5. Difference b/w single responsibility principle and encapsulation. Second Round(Technical): 1. Factory and Abstract Factory Design patter. Draw class diagram. 2. How memory management works in .NET? 3. Explain finalize and dispose with examples. 4. Implement Singleton class( asked in first round also) 5. Why are you looking for change? why did you leave your XXXXXX organization. Third round(Technical+Behavioral): 1. Different types of design pattern Interviewer asked almost all the design pattern one by one: Singleton, Factory, Abstract Factory, Decorator, Adapter, Command, Builder Design patter. 2. How to ensure the quality of a product? 3. Scenario based question:how to design a system such that it should support the backward compatibility b/w legacy s/w and a new version of code. what would be your approach? 4. what is SDLC? 5. Question from my current projects. 6. Few behavioral questions HR Round: Simple but asked a lot of questions like educational details, family details, salary expectation etc.

What is your strength and weakness