public override string execute(Blackfin bf, string[] args)
            {
                try
                {
                    switch (int.Parse(args[0]))
                    {
                    case 1:
                        return(bf.GetDNS1().ToString());

                    case 2:
                        return(bf.GetDNS2().ToString());

                    case 3:
                        return(bf.GetDNS3().ToString());
                    }
                }
                catch (FormatException)
                {
                }
                catch (OverflowException)
                {
                }

                throw new CommandArgumentException("Invalid DNS slot value");
            }