Enable Windows Event Log by Managed Code (.NET) / Command Line

Assuming you're talking about enabling/disabling system logs (Application, Security, Setup, System) I don't think it's possible.

Here's Event Log on Windows Dev center (required deeper poking to find useful info) http://msdn.microsoft.com/en-us/library/windows/desktop/aa964766%28v=vs.85%29.aspx

Here's part about registry settings: http://msdn.microsoft.com/en-us/library/windows/desktop/aa363648%28v=vs.85%29.aspx

Group Policy setting: http://blogs.technet.com/b/askds/archive/2008/08/12/event-logging-policy-settings-in-windows-server-2008-and-vista.aspx

Which interestingly allow you to enable or disable Setup log but none of the other default ones.

I just think that if you can't do it through registry or group policy then it can't be done.

Edit:

There is no way to programatically enable/disable event logs through the API. The only proof I have is that it's not there. So I checked other ways: PowerShell, WMI, Registry, Group Policy - something you can control from within the code. No joy. However, the only way to disable event log is to stop the service.

This should enable the event log programatically. It uses an EventLogSession parameter

    var elSession = new EventLogSession("computername", "domain", "username", password, SessionAuthentication.Default);
    var elConfig = new EventLogConfiguration("Microsoft-Windows-Wordpad/Admin", elSession);
    if (!elConfig.IsEnabled)
    {
        elConfig.IsEnabled = true;
        elConfig.SaveChanges();
    }