private async void GetCountryList(Action action)
        {
            CountryProvinces = await DependencyService.Get <IProvinceServices>().GetAsync();

            CountryList = CountryProvinces.Select(c => (string)c.CountryName).Distinct().ToList();
            action?.Invoke();
        }
        public async Task <List <string> > GetCountryList()
        {
            CountryProvinces = await DependencyService.Get <IProvinceServices>().GetAsync();

            CountryList = CountryProvinces.Select(c => (string)c.CountryName).Distinct().ToList();
            return(CountryList);
        }