initialize picker xamarin forms

Hi , I want to initialize my picker , this works fine on UWP , but on Android , it only works the first time and I do not know how to fix this .

    protected async override void OnAppearing()
        {
            base.OnAppearing();
            DataService d = new DataService();
            var locations = await d.GetLocatiosn();


            for (int x = 0; x < locations.Locations.Count(); x++)
            {
                if (locations.Locations[x].LocationID == Settings.DefaultLocation)
                {

                    break;

                }
            }

        }