Boxing and unboxing: when does it come up?

Question

So I understand what boxing and unboxing is. When\'s it come up in real-world code, or in what examples is it an issue? I can\'t imagine doing something like this example:

Answer 1

Since the advent of strongly-typed lists and dictionaries using generics with C# 2.0 (Visual Studio 2005), I think the importance of keeping boxing/unboxing in mind have been amazingly minimized. Add to that nullable types (int?, etc.) and using the null coalescing operator (??) and it really shouldn't be much of a concern at all and would likely not see it in any code that's not 1.1 Framework or earlier.