I've been writing apps in C# for about 5 years, and not once have I needed to know how GetHashCode works. I have looked at it at some point (don't remember why

I've been writing apps in C# for about 5 years, and not once have I needed to know how GetHashCode works. I have looked at it at some point (don't remember why, I think it had to do with an entity's identity for NHibernate) but I would fail this question even though most people I've worked with would rate me as a very effective (and efficient) programmer. This is why I feel I would do badly in these kinds of trivia-like interviews (once since I put linux administration on my resume, I was asked how to delimit lines in bash scripting). My dream interview, one where I'd shine, is where I'm given a problem, and I have to go through designing solutions and discussing tradeoffs. I don't mind writing code either, but I would not know the answer to this kind of very specific question, I'd just know how to solve problems.