public IList <Factura> FiltrarFacturasCedula(string cedula)
 {
     try
     {
         Conection.Open();
         Facturas = FacturaRepositorio.FiltrarFacturasCedula(cedula);
         Conection.Close();
         return(Facturas);
     }
     catch (OracleException ex)
     {
         Conection.Close();
         return(null);
     }
 }