private void LoadUsers() { List <EMPLOYEE> users = _basicService.LoadAllEMPLOYEE(_businessParam).OrderBy(c => c.NAME).ToList(); users.Insert(0, new EMPLOYEE { NAME = "---", ID_EMPLOYEE = -1 }); cboUser.DataSource = users; cboUser.DisplayMember = "NAME"; cboUser.ValueMember = "ID_EMPLOYEE"; }