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);
}