private void SearchBar_TextChanged(object sender, TextChangedEventArgs e)
 {
     if (e.NewTextValue.Length > 3)
     {
         lstMVA.BindingContext = MVUFactory.BindingWithGrouping(e.NewTextValue);
     }
     else if (string.IsNullOrEmpty(e.NewTextValue))
     {
         lstMVA.BindingContext = MVUFactory.BindingWithGrouping();
     }
 }
 private void lstMVA_Refreshing(object sender, EventArgs e)
 {
     MVUFactory.RefreshCount++;
     lstMVA.BindingContext = MVUFactory.BindingWithGrouping();
     lstMVA.IsRefreshing   = false;//refresi bitir.
 }
 public Page1()
 {
     InitializeComponent();
     //lstMVA.BindingContext = MVUFactory.MVUdata;
     lstMVA.BindingContext = MVUFactory.BindingWithGrouping();
 }