CollectionView view = (CollectionView)CollectionViewSource.GetDefaultView(lvSupplier.ItemsSource);
            view.Filter = SupplierFilter;
private bool SupplierFilter(object obj)
        {
            if(String.IsNullOrEmpty(txtFilter.Text))
            {
                return true;
            }
            else
            {
                return ((obj as NHACUNGCAP).TENNHACUNGCAP.IndexOf(txtFilter.Text, StringComparison.OrdinalIgnoreCase) >= 0);
            }
        }
private void txtFilter_TextChanged(object sender, TextChangedEventArgs e)
        {
            CollectionViewSource.GetDefaultView(lvSupplier.ItemsSource).Refresh();
        }
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