private void ControlsToData()
{
if (lvList.Items.Count == 0)
{
_switching = null;
}
else
{
_switchItems.Clear();
foreach (ListViewItem item in lvList.Items)
{
_switchItems.Add((Item) item.Tag);
}
if( _switching == null )
_switching = new Switching();
_switching.Items = _switchItems;
}
}