How to check every 30seconds with dispatchertimer without affect the UI in c#?

Question

I hav tried the below code for checking reports from server in every 30seconds,but after 30seconds tick,The application hangs for several seconds.How to avoid the Hanging problem. The below code am tried,what change want to given in this?

System.Windows.Threading.DispatcherTimer dispatcherTimer2 = new System.Windows.Threading.DispatcherTimer();
 dispatcherTimer2.Tick += new EventHandler(dispatcherTimer2_Tick);
 dispatcherTimer2.Interval = new TimeSpan(0, 0, 30);


Public void dispatcherTimer2_Tick(object sender, EventArgs e)
{
   dispatcherTimer2.start();
    //code for function call autoreport();
}

Answer 1

DispatcherTimer callback is executed on main UI thread and blocks it. Use System.Threading.Timer and if you need to update user interface from timer callback use one of Dispatcher.Invoke overloads. In code something like this

public partial class MainWindow : Window
{
    System.Threading.Timer timer;
    public MainWindow()
    {
        InitializeComponent();
        timer = new System.Threading.Timer(OnCallBack, null, 0, 30 * 1000);
    }


    private void OnCallBack(object state)
    {
        //code to check report 
        Dispatcher.Invoke(() =>
        {
            //code to update ui
            this.Label.Content = string.Format("Fired at {0}", DateTime.Now);
        });
    }
}