public void UpdateConnector(ListViewItem item, Connector connector)
{
String description = connector.Description;
String id = connector.ID;
String name = connector.name;
String type = connector.type;
item.SubItems[0].Text = id;
item.SubItems[1].Text = name;
item.SubItems[2].Text = type;
item.SubItems[3].Text = connector.Pins == null ? "0" : "" + connector.Pins.Count;
item.Tag = connector;
}