private void ComboBoxItem_DropDown(object sender, EventArgs e)
{
BLInvoice blItem = new BLInvoice();
List <ItemModel> lista = new List <ItemModel>();
lista = blItem.getItems();
var source = new BindingSource(lista, null);
comboBoxItem.ValueMember = "ClientId";
comboBoxItem.DisplayMember = "Fullname";
comboBoxItem.DataSource = source;
}
