public Task <IEnumerable <ICountry> > GetCountriesAsync()
 {
     return(ExecuteAsync(async() =>
     {
         using CountryModelHandler countryModelHandler = new CountryModelHandler(DbContext, ContactModelConverter.Create());
         return await countryModelHandler.ReadAsync();
     },
                         MethodBase.GetCurrentMethod()));
 }
        public Task <ICountry> GetCountryAsync(string code)
        {
            NullGuard.NotNullOrWhiteSpace(code, nameof(code));

            return(ExecuteAsync(async() =>
            {
                using CountryModelHandler countryModelHandler = new CountryModelHandler(DbContext, ContactModelConverter.Create());
                return await countryModelHandler.ReadAsync(code);
            },
                                MethodBase.GetCurrentMethod()));
        }