public WindowOneViewModel()
 {
     People = new AsyncObservableCollection <Person>()
     {
         new Person()
         {
             Id = 1, Name = "Marcus", City = "New York"
         },
         new Person()
         {
             Id = 2, Name = "Ove", City = "Stockholm"
         },
         new Person()
         {
             Id = 3, Name = "Jaidi", City = "Bangkok"
         }
     };
 }
        public NewWindowViewModel()
        {
            _dayCommand = new RelayCommand(GetDay);

            People = new AsyncObservableCollection <Person>()
            {
                new Person()
                {
                    Id = 1, Name = "Marcus", City = "New York"
                },
                new Person()
                {
                    Id = 2, Name = "Ove", City = "Stockholm"
                },
                new Person()
                {
                    Id = 3, Name = "Jaidi", City = "Bangkok"
                }
            };

            var assembliesTypeName = Assembly.GetExecutingAssembly().GetTypes().Take(5).Select(t => t.FullName).ToList();

            AssemblyTypes = new AsyncObservableCollection <string>(assembliesTypeName);
        }