I wonder how localization works

I'm a newbie here, and know a little bit about how to use localization. Just like what i'm doing in design mode, I change the language, and then change the text property of a label. That's really working.

But what i want to do is, if I have to change my label.text in runtime mode, how can localization works?

Can anyone do some explains here for a newbie?

[371 byte] By [aping] at [2007-12-16]