You work as an application developer at Certkiller .com. You have been asked to profile a business application that can be accessible using the Event Log API. You have started by adding the following code to create a custom event log： 
if （EventLog.SourceExists （"Application1"）） 
EventLog.DeleteEventSource （"Application1"）； 
//Create new event log 
EventLog.CreateEventSource （"Application1"， "Profile"）； 
You need to write an event to the Application1 event log. What code must you use？（）