How to update a control outside of an updatepanel?

Question

I am going to show some text in a TextBox, which is located outside of an updatepanel, after checking a CheckBox but I cannot make it work. please help me out ?

Here

Answer 1

The textbox has to be in update panel also.

*Edit:

I am sorry I didn't read your question properly. Perhaps write a javascript function, and call the function from codebehind?