reflection - adding/changing label text

i have a couple of labels that i do not know the names of at compile time.
i will only know these names at runtime.

I would like to change the text of these labels at runtime using reflection.

I am able to use reflection to get at properties and methods, but am having trouble getting at an actual control on the page usch as a Label or a Textbox.

Thanks in advance.

Why not use javascript?

What is the context of your question, how have you ended up in this scenario?