public LoginViewModel()
 {
     LoginCommand = new Command(async() =>
     {
         if (IdDeezer == null || IdDeezer.Equals(""))
         {
             await Application.Current.MainPage.DisplayAlert("alert", "pas de id deezer", "Ok");
         }
         else
         {
             Application.Current.MainPage = new NavigationPage(new PlaylistView(Int32.Parse(IdDeezer)));
         }
     });
 }
 public LoginViewModel()
 {
     LoginCommand = new Command(() =>
     {
         if (IdDeezer == null || IdDeezer.Equals(""))
         {
             Application.Current.MainPage.DisplayAlert("alert", "pas de id deezer", "Ok");
         }
         else
         {
             Application.Current.MainPage.DisplayAlert("alert", "mon id deezer : " + IdDeezer, "Ok");
         }
     });
 }