Accessing ArrayList Across Mutiple Windows Forms

Question

Hi all, I am designing a project that contains mutiple windows forms. In my Main Form I declared an ArrayList variable to store various objects. I have an "Add" button on the Main Form which loads a new form where the user can enter information (creating an object behind the scenes). I want to add this object to my Array List in my Main Form. Can anyone give me some tips on an efficient way to do this? Thanks, Zach(Nevermore)