public static async Task <bool> ExistsNormalizedUserNameAsync(string normalizedUserName)
        {
            var cmd = new CommandAppUserExistsNormalizedUserName(normalizedUserName);

            cmd = await DataPortal.ExecuteAsync(cmd);

            return(cmd.Exists);
        }
        public static bool ExistsNormalizedUserName(string normalizedUserName)
        {
            var cmd = new CommandAppUserExistsNormalizedUserName(normalizedUserName);

            cmd = DataPortal.Execute(cmd);

            return(cmd.Exists);
        }