private void HienThiDanhSachSinhVien()
{
lvSinhVien.Items.Clear();
foreach (Student st in st.LayDanhSachSinhVien())
{
ListViewItem lvi = new ListViewItem(st.codeClass);
lvi.SubItems.Add(st.codeStudent + "");
lvi.SubItems.Add(st.nameStudent);
lvi.SubItems.Add(st.genderStudent);
lvi.SubItems.Add(st.address);
lvSinhVien.Items.Add(lvi);
}
}