C#- Project with DLLs

Question

Hi there,

I have never worked with dlls and i just started working with C#. i have never really worked with any programming languages that has anything to do with dlls.
I have to do couple of things.

project 1 : dll
project 2 : exe (loads dll)

step 1: I have to write a dll method returns "hello world"

step 2: import this dll into exe project 2

step 3: have exe display return from dll method

I am so lost :S ur help will be highly appreciated thank you