updatepanel and updateprogress panel

Take a look at the Timer control:http://ajax.asp.net/docs/overview/UsingTimerControlTutorial.aspx

I have and its not working how I need it.

I need to write a server varaible to the updatepanel and have the update panel update every 3 seconds. If I do this (from the examples)

protectedvoid Timer1_Tick(object sender,EventArgs e)

{

double output = 1 +newRandom().NextDouble();

lbl.Text = .ToString();

}

and the label will update every 3 seconds. Now I need lbl.text be a data value that will need to change when it changes