love switch!

Bro I was trying to just remeber the Concat(). I'm trying to use the Linq library at it's maximum.

This is way faster than using Linq, if performance is important

I second this!!!

exactly , i don't know why people talking about negative values when your code is already pass the goal of the exercise/test

Try to logout and login again.

why the sarcasm?

I could have never thought you can do it in a single line of code!
Brilliant!

I would love an explanation of this one.

Nice work. Thanks for expanding my knowledge base.

Sandip, you hired!

Can someone explain this solution? Thanks.

But we return square digit, and negative in square is a positive number. So I think it doesn`t matter