How to create an eventlog SUB Folder

At the moment I have:

// *** log creation rules ***
// - must have admin right on Windows Vista and up
// - only first eight chars are discriminating and must be unique
// - will automaticalle create new log if not existant
// - needs some time to create and refresh, or reboot app
// - cannot be written until created
// - App name == source and must be unique
// - logs go default under Appplication Log
// - since source name must be unique check it before creation otherwise exceptiom
// - source doe not really have to exist as a code file...???!!! -> no
// - also logname must be unique
// - must use system diagnostics namespace
// - must open a new instance of eventlogger to see it; refresh does not work // sometimes it does work? test
// - deletes work direct
// - log to delete must exist first
// - sourcename still exist after log is deleted; reboot required?
// http://msdn.microsoft.com/en-us/library/2awhba7a.aspx for conditions

// Should create the following eventviewer structure:
// Eventviewer
// Application & Services Logs
// ApplicationName
// Service
// UI
// etc...
if (!System.Diagnostics.EventLog.SourceExists("11ApplicationName") && !System.Diagnostics.EventLog.SourceExists("11ApplicationName"))
{
System.Diagnostics.EventLog.CreateEventSource("11ApplicationName", "folder");
System.Diagnostics.EventLog.CreateEventSource("12ApplicationName", "subfolder");
}