Thanks to x-box gamer but here is question about files!

Question

Thanks man, you helped me 100% with ArrayList, but now I have another problem: for example, i have struct named "person", and i have an array of persons. When I close my program, I want to save all of theme into a file(not Database), for example named "c:\example.exa",------HOW!!!??? I know for System.IO and its File and StreamFile, but they can save string(text). I wanna save MY type of data(struct for example)!!! Thank You!