public IList <Factura> ConsultarFacturas()
 {
     try
     {
         Conection.Open();
         Facturas = FacturaRepositorio.ConsultarFacturas();
         Conection.Close();
         return(Facturas);
     }
     catch (OracleException e)
     {
         Conection.Close();
         return(Facturas = new List <Factura>());
     }
 }