This log helper class seems to get used over and over again in projects I've worked on. Generally I use it as a fallback, calling it from an exception block in a application logging code. Let me know if you find it helpful.

public static class LogHelper
{
  public static bool WriteEventLogEntry(string source, EventLogEntryType entryType, int eventId, string message)
  {
    bool passFail = true;
    try
    {
      if (!EventLog.SourceExists(source))
      {
        EventLog.CreateEventSource(source, "Application");
      }
      EventLog elog = new System.Diagnostics.EventLog();
      elog.Source = source;
      elog.WriteEntry(message, entryType, eventId);
    }
    catch
    {
      passFail = false; //this method is usually called as a last resort, so there can be no real exception handling
    }
    return passFail;
  }
}