Client sided control

[agb]

Hi
I need an example to understand the client-sided control

For example ;

I need a (I think a javascript code) in a ascx file

Then in a web form I want to write the Listbox1.selecteditem.text to the
textbox1.text

I do not have enough informtaion about this subject.

I heard about a Render method but not know anything

is there a good informtaion about this subject? or could you please send me
an example?


Please help.
THANKS...