Where did the issue of closures in C#?

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I remember a couple months ago studied closures in C#.
Quite problematic to quickly understand the subject.
But at the time I figured out thanks to this post on habré:

Now here I decided to refresh my memory, because I so, in practice, and not useful circuit. But it is a topic that needs to know regardless of whether you use it or not. A favorite question at interviews.

So, the crux of the problem...an example of Habra no longer demonstrates the issue of closures.
In other words, even the first example (that trick) I have displays the correct result (1 2 3 4).
What exactly did I miss?
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1 Answer

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Starting with C# 5.0, variables declared in "foreach", are considered as internal variables of the loop. I.e., the circuit is no longer here.

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