Methods, confused!

[Candystore]

Heya,

I'm having a hard time wrapping my head around the OOP design of C# and how to correctly use methods.

Say I want to create a function that will be called multiple times(which I guess is always called a method in C#?).

I obviously don't want to put it in my main class, since I will call it more than once.

I can't seem to make any function outside of a class .. anything that happens in C# happens inside a class or structure type, period?

If I want to put my algorithm outside of my main function, which doesn't have any variables and which simply needs to be called (uses 2 parametres), I create a static class?

If any small function would reside in a class which uses a reference, wouldn't that create a lot of overhead?

Thank you.