Boxing vs Unboxing

Question

Another recent C# interview question I had was if I knew what Boxing and Unboxing is. I explained that value types are on Stack and reference types on Heap. When a value is cast

Answer 1

I think the answer to your question with unboxing is that: The result of an unboxing conversion is a temporary variable (more details: link).

I think you were trying to do sth like:

object a = new Point(10,10);
object b = new Point(20,20);
a = b;

((Point) b).X = 30; //after this operation also a.X should be 30

The above code won't compile - details in the link above, and I think this is the answer to your question:

I was expecting to see b == 2 as well, but it isn't, why? is it because the second boxing destroys and replaces the whole (a)-object on heap?