Helper.cs for AppPoolController Class

AppPoolController.Helper.cs

public class SystemCriticalException
    : Exception
{
    public SystemCriticalException() { }

    public SystemCriticalException(string message)
        : base(message) { }

    public SystemCriticalException(string message, Exception inner)
        : base(message, inner) { }
}

internal class CriticalExceptionLogger
{
    /// <summary>
    /// Log4net log handle.
    /// </summary>
    readonly static ILog log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

    internal static void Log(Exception exception, string format, params object[] args)
    {
        string message = string.Format(format, args);
        log.Fatal(message, exception);
    }

}