// 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();
}