public List <double[]> layToaDoDat(TYPE_OBJECT type)
 {
     if (type == TYPE_OBJECT.MAY_CAT)
     {
         return(this.tapMC_toaDo);
     }
     else if (type == TYPE_OBJECT.DAO_TU_DONG)
     {
         return(this.tapDTD_toaDo);
     }
     else
     {
         return(this.tapDB_toaDo);
     }
 }
 public List <string> layViTriDat(TYPE_OBJECT type)
 {
     if (type == TYPE_OBJECT.MAY_CAT)
     {
         return(this.tapMC);
     }
     else if (type == TYPE_OBJECT.DAO_TU_DONG)
     {
         return(this.tapDTD);
     }
     else
     {
         return(this.tapDB);
     }
 }