title: c# updatepanel with timer page_load
body: <p>I'm experimenting with some AJAX now.  I have a custom control which appears on my masterpage in which there is an update panel and a timer.  The timer fires and the panel updates and everything is dandy.  Except that there are some operations that I don't want it to perform on every refresh.  It seems like the entire page lifecycle happens with each refresh.  There are variables I want to set, and keep their value on the refresh.  Is there a way to make it perform ONLY what's in the timer_tick call?</p>