The ScriptCompleted event is raised when a script execution
initiated by the application completes. The Response argument
specifies the string returned by the script, and the StatuCode
value indicates success (1) or failure (0). If the script contained
errors or could not be executed, the status code will be zero.
Applications typically use this event to retrieve values from the
page, execute custom logic in response to script results, or detect
when asynchronous script operations have finished. Because script
execution is asynchronous, this event is the definitive way to know
when a script call has finished.