Have you used Design Pattern (C#) in your project?
One of my interview questions was 'Have you used Design Pattern (C#) in your project?'. Though I've used only singleton pattern so far in my project I was managed to explain that alone. I've read more articles to explain other patterns theoretically. But he wanted to explain the scenarios and patterns with code.
If you have used design pattern in your projects please do explain the scenario you used and please do provide your code. So that I could get better idea.