How to replace for-loops with a functional statement in C#?

Question

A colleague once said that God is killing a kitten every time I write a for-loop.

When asked how to avoid for-loops, his answer was to use a functional language. However

Answer 1

The question is if the loop will be mutating state or causing side effects. If so, use a foreach loop. If not, consider using LINQ or other functional constructs.

See "foreach" vs "ForEach" on Eric Lippert's Blog.