public string Conectar_Base_Datos()
        {
            Cls_BD_BLL obj_BD_BLL = new Cls_BD_BLL();
            Cls_BD_DAL obj_BD_DAL = new Cls_BD_DAL();

            obj_BD_BLL.Crear_Conexion(ref obj_BD_DAL);
            return(obj_BD_DAL.SMsError);
        }