public static bool ExistBinding(string sitename, string domain)
        {
            using (var iisManager = new ServerManager())
            {
                var site = iisManager.Sites.FirstOrDefault(x => x.Name == sitename);
                if (site == null) return false;
                var binding = site.Bindings.FirstOrDefault(x => x.Host == domain);
                if (binding == null) return false;
            }
            return true;
        }