Questions every good NET developer should be able to answer

Question

My company is in the process of hiring.NET professionals. We deal with ASP.NET, Compact Framework, Windowsforms, and Web Services, among other.NET platforms. I'd like to put together a list/catalog of useful questions as a type of minimal criteria for determining whether or not the applicants have prior experience. So, here's my question:

What questions do you believe a good.NET programmer should be able to answer?

I'd also use it as a self-checklist to evaluate where my own deficiencies are (I have many!)

Answer 1

If I were interviewing someone who knew LINQ, I'd probably just ask them to explain it to me. They should be able to describe deferred execution, streaming, the IEnumerable/IEnumerator interfaces, foreach, iterator blocks, and expression trees (at least for extra points). (I'm thinking of the instance where they've claimed to know enough LINQ to make it a legitimate inquiry - admittedly, they could be "decent" developers and not "understand" LINQ yet.)

I've previously asked several of the questions listed above, as well as a few others:

• Difference between reference and value types
• Delegates
• Strings, immutability, character encodings
• Pass by reference vs pass by value
• IDisposable and finalizers
• Nullable types
• Floating point
• Generics