.NET (Core and Framework)

CloseWindowCommand = new RelayCommand<BustaMainView>(CloseWindow);
 OpenBustaMainView = new RelayCommand<BustaMainView>(OpenWindow);


BustaMainView w;
        public void OpenWindow(object parameter)
        {  w = new BustaMainView(); w.Show(); this.GetdatiBusta(); }
                     


        public void CloseWindow(object obj)
        {
            w.Close();
  
        }

 public void GetdatiBusta()
        {

            foreach (var item in _serviceProxy.GetBusta())
            {
               
                BustaOservable.Add(item);
                RaisePropertyChanged("GetDatiBuste");
            }