public void AddContact(ManufacturerDataContact contact)
{
if (manufacturer.Contacts == null)
manufacturer.Contacts = new List<ManufacturerDataContact>();
manufacturer.Contacts.Add(contact);
ListViewItem item = new ListViewItem(contact.name);
item.SubItems.Add(contact.phoneNumber);
item.SubItems.Add(contact.email);
item.Tag = contact;
Items.Add(item);
}