public static DATABASEDataContext getInstance()
 {
     if (data == null)
     {
         data = new DATABASEDataContext();
     }
      return data;
 }
 public CamionManage(TrucksManager mgr)
 {
     data = DataConexion.getInstance();
     cmanager = mgr;
 }
 public CarreroManage(CartersManager mgr)
 {
     data = DataConexion.getInstance();
     cmanager = mgr;
 }
 public ViajesManage(TravelsManager mgr)
 {
     data = DataConexion.getInstance();
     setManager(ref mgr);
     toDGV();
 }
 private DataConexion()
 {
     data = new DATABASEDataContext();
 }
 public SupplierManage()
 {
     data = DataConexion.getInstance();
     model = new ModelSupplier();
 }