public MainViewModel()
        {
            _pvm             = new CustomerViewModel();
            _customers       = _pvm.Customers;
            _ivm             = new ItemsViewModel();
            _listitems       = _ivm.ListItems;
            _isvm            = new ItemsecondViewmodel();
            _listseconditems = _isvm.listItems;
            var person = new Models.CustomerDetail();

            person.FirstName   = "sumit";
            person.PhoneNumber = 987813272;
            person.LastName    = "sharma";
            _pvm.add1(person);
            var person1 = new Models.CustomerDetail();

            person1.FirstName   = "akshay";
            person1.LastName    = "kumar";
            person1.PhoneNumber = 123456789;
            _pvm.add1(person1);
            var items = new Models.ListItemssecond();

            items.ItemName  = "pencil";
            items.ItemPrice = 200;
            items.Discount  = 5;
            _isvm.additems(items);
            var items2 = new Models.ListItemssecond();

            items2.ItemName  = "Eraser";
            items2.ItemPrice = 100;
            items2.Discount  = 2;
            _isvm.additems(items2);
        }
 public void additems(Models.ListItemssecond listItemssecond)
 {
     _listitems.Add(listItemssecond);
 }