Reference type in C#

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Both person and person2 are references, to the same object. But these are different references. So when you are running

person2 = null;

you are changing only reference person2, leaving reference person and the corresponding object unchanged.

I guess the best way to explain this is with a simplified illustration. Here is how the situation looked like before person2 = null:

Before null assignment

And here is the picture after the null assignment:

Enter image description here

As you can see, on the second picture person2 references nothing (or null, strictly speaking, since reference nothing and reference to null are different conditions, see comment by Rune FS), while person still references an existing object.

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