ASP.NET 4 Unleashed

Using the Timer Control

The ASP.NET AJAX Timer control enables you to refresh an UpdatePanel (or the entire page) on a timed basis. The Timer control has one important property:

• Interval— The amount of time, in milliseconds, between Tick events. The default value is 60,000 (1 minute).

The Timer control raises a Tick event every so many milliseconds, depending on the value of its Interval property.

If you don’t associate the Timer control with an UpdatePanel, the Timer posts the entire page back to the server performing a normal postback. For example, the page in Listing 38.22 posts the entire page back to the server every 2 seconds.

Listing 38.22. TimerPage.aspx

A more typical use of the Timer control is to refresh an UpdatePanel control’s ...