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But sir inside main there is a call to the function right? so the function should be executed right. ?
– callyaser
Commented Feb 2, 2015 at 4:16
1

@callyaser No, you're calling a function that returns an IEnumerable - in other words, GetNosLessThan5 returns an object that says "I can be iterated over". It does not return the result of the enumeration - for that you'd have to call .ToList or a similar method that actually calculates the numbers. Iterators are a bit of compiler magic in C#.
– Michael Stum
Commented Feb 2, 2015 at 4:18
(This is an optimization technique since Iterators can be expensive to run, or even infinite. It's the callers responsibility to decide if, when, and how long to run it)
– Michael Stum
Commented Feb 2, 2015 at 4:19

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