// Updated Code. d = (Dealer)MainListBox.SelectedItem
private void btnDealerLoadTockets_Click(object sender, EventArgs e)
{
List<Dealer> dlist = LoadDealersList();
Dealer d = (Dealer)MainListBox.SelectedItem;
d = dlist.Find(x => x == d);
for (int i = 0; i < dlist.Count; i++)
{
Console.WriteLine(d.name);
}
}