Filter ListView Data Will Not Show on ListView Activated When You Search Record Then Record Will Show in XAF

Here I have a Class ContactA
I want Data Will not Populate in ListView on ListView Activated
Data Will Show when I search any Thing from search Button

protected override void OnActivated()
{
base.OnActivated();
if (View is ListView && View.ObjectTypeInfo.Type == typeof(ContactA))
{
ListView lv = (ListView)View;
lv.CollectionSource.CollectionChanged += new EventHandler(CollectionSource_CollectionChanged);
}
}

void CollectionSource_CollectionChanged(object sender, EventArgs e)
{
ListView listView = (ListView)View ;
if (listView.CollectionSource.Collection.Count > 0)
{
if (!listView.CollectionSource.Criteria.ContainsKey("EmptyCollectionCriteria"))
{
listView.CollectionSource.Criteria.Add("EmptyCollectionCriteria", CollectionSource.EmptyCollectionCriteria);
}
listView.CollectionSource.Criteria.Changed += new EventHandler(Criteria_Changed);
}
}

void Criteria_Changed(object sender, EventArgs e)
{
ListView listView = (ListView)View;
listView.CollectionSource.Criteria.Remove("EmptyCollectionCriteria");
}