<ListView x:Name="leftListView" Grid.Column="0" Grid.Row="1">
            <TextBlock Text="{Binding}"></TextBlock>

        </ListView>
 private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            string[] fileEntries = System.IO.Directory.GetFileSystemEntries(@"C:\");
            foreach (string fileName in fileEntries)
                leftListView.Items.Add(fileName);
        }