How to refresh items at runtime using Timer in .NET MAUI ListView(SfListView) ?

public class Behavior : Behavior<ContentPage>
{
   #region Fields
    private Syncfusion.Maui.ListView.SfListView listView;
   #endregion
 
  #region Overrides
  protected override void OnAttachedTo(ContentPage bindable)
  {
      InitializeTimer();
      listView = bindable.FindByName<Syncfusion.Maui.ListView.SfListView>("listView");
      listView.PropertyChanged += ListView_PropertyChanged;
      base.OnAttachedTo(bindable);
  }
  private void ListView_PropertyChanged(object sender, PropertyChangedEventArgs e)
  {
      if (e.PropertyName == "ItemsSource")
          InitializeTimer();
  }
 private async void InitializeTimer()
 {
    await WaitAndExecute(2000, () =>
    {
        var viewmodel = new ContactInfoRepository();
        listView.ItemsSource = viewmodel.ContactInfo;
    });
 }
 private async Task WaitAndExecute(int milisec, Action actionToExecute)
 {
    await Task.Delay(milisec);
    actionToExecute();
 }
 protected override void OnDetachingFrom(ContentPage bindable)
 {
     listView = null;
     base.OnDetachingFrom(bindable);
 }
 #endregion
}