Please select a continent from the continent combobox
to populate the countries combobox, without reloading the page.

Continent:	Europe Asia North America South America Australia Africa
Country:	Please select a continent from the list above

This example demonstrates the execution order of the client-scripts
triggered by the server-side methods ExecBeforeLoad and ExecOnLoad.
In the panel below you will see the order of execution.

Execution order

View ExecBeforeLoad tutorial.
View ExecOnLoad tutorial.