public override bool ValidateData()
        {
            DomName d = DomName.Root;
            string  x;
            string  y   = "";
            var     rdr = new System.IO.StringReader(txtTo.Text.Trim());

            while (true)
            {
                x = rdr.ReadLine();
                if (x == null)
                {
                    break;
                }
                if (x.Length == 0)
                {
                    continue;
                }
                x = x.Replace(" ", "");
                if (!DomName.TryParse(x, ref d))
                {
                    ShowErr("Invalid domain name in 'Alias zone names': " + x);
                    return(false);
                }
                y += x + "\r\n";
            }
            rdr.Close();
            txtTo.Text = y;
            if (y.Length == 0)
            {
                ShowErr("At least one Alias Zone Name must be specified");
                return(false);
            }

            txtFrom.Text = txtFrom.Text.Trim().ToLowerInvariant();
            if (!DomName.TryParse(txtFrom.Text, ref d))
            {
                ShowErr("Invalid 'Clone from zone' domain name");
                return(false);
            }
            return(true);
        }
        public void TryParse_should_detect_non_registered_prefixes()
        {
            DomName qn;

            Assert.False(DomName.TryParse("nonexistant:a", out qn));
        }