Dynamics AX 2009: Write to eventlog entry

Our client requested to keep track of all Dynamics AX system errors during the User Acceptance Testing. I use the application event logs to store the information.
The following code shows you how to write event log entry with X++:
Create a new class AX_EventLog with a static method WriteEventLog:
static void WriteEventLog(Exception _exception, str _event)
{
    str eventSource = "AX event";
    str logType = "Application";
    System.Diagnostics.EventLogEntryType eventLogEntryType;
    int eventCategory = 9999;
    ;
    switch(_exception)
    {
        case Exception::Info:
            eventLogEntryType = System.Diagnostics.EventLogEntryType::Information;
            break;
        case Exception::Warning:
            eventLogEntryType = System.Diagnostics.EventLogEntryType::Warning;
            break;
        default:
            eventLogEntryType = System.Diagnostics.EventLogEntryType::Error;
    }
    if (!System.Diagnostics.EventLog::Exists(eventSource))
    {
        System.Diagnostics.EventLog::CreateEventSource(eventSource, logType);
    }
    System.Diagnostics.EventLog::WriteEntry(eventSource, _event, eventLogEntryType, eventCategory);
}
In the Info class,

Exception add(
    Exception _exception,
    str _txt,
    str _helpUrl = ”,
    SysInfoAction _sysInfoAction = null,
    boolean buildprefix = true)
{
    …
    AX_EventLog::WriteEventLog(_exception, _txt);
    …
}
Here we go, event log entry…