// method for timer
 private void Update(object stateInfo)
 {
     NetNewsServerConnection netNewsServerConnection = new NetNewsServerConnection(newsListView);
     netNewsServerConnection.DownloadData();
 }
 // method for refresh button
 public void Update(NewsListViewModel newsListView)
 {
     NetNewsServerConnection netNewsServerConnection = new NetNewsServerConnection(newsListView);
     netNewsServerConnection.DownloadData();
 }