public Result<bool> editMon(string ma, string ten)
 {
     Mon_ctrl temp = new Mon_ctrl();
     return temp.edit_mon(ma, ten);
 }
 public Result<bool> deleteMon(string ma)
 {
     Mon_ctrl temp = new Mon_ctrl();
     return temp.delete_mon(ma);
 }
 public Result<List<Mon_ett>> selectAllMon()
 {
     Mon_ctrl temp = new Mon_ctrl();
     return temp.select_all_mon();
 }
 public Result<List<Mon_ett>> selectByFieldsMon(string inputName, string how)
 {
     Mon_ctrl temp = new Mon_ctrl();
     return temp.select_by_fields(inputName, how);
 }
 public Result<bool> insertMon(string ma, string ten)
 {
     Mon_ctrl temp = new Mon_ctrl();
     return temp.insert_mon(new Mon_ett(ma, ten));
 }