C#: What is the best way for managing and searching through small collections of data?

Hello,

okay, here's my problem: I've written a small class containing some atom names as well as their formula symbols and the corresponding image (it's for a game). Storing the data is just fine. But I'm having a problem searching the instantiated classes for a specific, let's say, formula symbol.

This is what I've tried (just for your information):

public class Atom

{

public string name;

public string formSymbol;

public Surface aSurface;

public Atom(string Name, string formula_symbol, Surface surface)

{

this.name=Name;

this.formula_symbol=formSymbol;

this.aSurface=surface;

}

}

But of course searching through instances of a class by formula symbol (string formula_symbol) does not work.

So, what is the fastest and easiest way to search small collections of data? Which data structure should be used?