public PersonViewModel()
{
personData = DependencyService.Get <IPersonData>();
OnPersonDataBind = async() =>
{
PersonList = new ObservableCollection <PersonModel>((await personData.GetPersonData()).ToList());
};
OnPersonDataBind();
//PersonList = new ObservableCollection<PersonModel>(personData.GetPersonData().Result.ToList());
DeleteCommand = new Command((name) => OnDeleteCommand(name.ToString()));
}