public void callback()
{
int carbinetIndex = Program.frmClassRoom.carbinetIndex;
int floorNumber = Program.frmClassRoom.floorNumber;
int columnNumber = Program.frmClassRoom.columnNumber;
string epc = MemoryTable.getPersonEpcByPosition(carbinetIndex, floorNumber, columnNumber);
Person p = MemoryTable.getPersonByEpc(epc);
frmShowStudentInfo frm = new frmShowStudentInfo(p.id_num);
frm.ShowDialog();
}
