Give each listview item unique nr

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C#

if you look picture http://imageshack.us/f/190/sh*t34.png/[^]

I have not created any ID in listviewitem

Here are my classes

http://imageshack.us/f/692/sh*t33.png/[^]

In Customer class i have

public int ID
{
    get
    {
        return id;
    }
    set
    {
        id = value;
    }
}

which i then wants to determine by a CustomerManger object


anyway what can i do to make an ID where i wants the ID to start with 100 and can also understand if item is deleted.

listviewitem = new ListViewItem(); //here should be the ID
listviewitem.SubItems.Add(contact.FirstName);
listviewitem.SubItems.Add(contact.LastName);
listviewitem.SubItems.Add(phone.Home);
listviewitem.SubItems.Add(phone.Mobile);
listviewitem.SubItems.Add(address.Country);
listviewitem.SubItems.Add(address.ZipCode);
listviewitem.SubItems.Add(address.City);
listviewitem.SubItems.Add(address.Street);
listviewitem.SubItems.Add(email.Personal);

this.listView1.Items.Add(listviewitem);