/// <summary>
        /// Load thong tin chung cua hoc sinh bao gom ca diem len listview DSHS
        /// </summary>
        void LoadDSHS_DSHS()
        {
            DShocsinhBLL hocSinhbll = new DShocsinhBLL();
            List <ThongTinChungHS_DiemTB> listThongTinChungHocSinh;

            if (cbTieuChiTimKiem.SelectedIndex == 0)
            {
                listThongTinChungHocSinh = hocSinhbll.GetDanhSachHocSinh_ThongTinChung_TimKiemTheoTen(tbTuKhoaTimKiem.Text);
            }
            else
            {
                listThongTinChungHocSinh = hocSinhbll.GetDanhSachHocSinh_ThongTinChung_TimKiemTheoLop(tbTuKhoaTimKiem.Text);
            }

            lvdshs.Items.Clear();
            int          soThuTu   = 1;
            HocKyBLL     hockybll  = new HocKyBLL();
            List <HocKy> listhocky = hockybll.GetListHocKy();

            foreach (ThongTinChungHS_DiemTB hocsinh in listThongTinChungHocSinh)
            {
                int indexHocKy = 0;
                for (int i = 0; i < listhocky.Count; i++)
                {
                    if (listhocky[i].MaHocKy == hocsinh.maHocKy)
                    {
                        indexHocKy = i + 4;
                    }
                }

                bool kiemTraTonTai = false;
                if (lvdshs.Items.Count > 0)
                {
                    foreach (ListViewItem lvitem in lvdshs.Items)
                    {
                        if (lvitem.SubItems[1].Text == hocsinh.maHocSinh)
                        {
                            kiemTraTonTai = true;
                            lvitem.SubItems[indexHocKy].Text = hocsinh.diemTB;
                            break;
                        }
                    }
                }

                if (!kiemTraTonTai)
                {
                    ListViewItem lvi = new ListViewItem(soThuTu + "");
                    lvi.SubItems.Add(hocsinh.maHocSinh);
                    lvi.SubItems.Add(hocsinh.TenHocSinh);
                    lvi.SubItems.Add(hocsinh.Lop);
                    lvi.SubItems.Add("NULL"); // diem tb hoc ki 1
                    lvi.SubItems.Add("NULL"); // dim trung binh hk 2
                    lvi.SubItems.Add("NULL"); // dim trung binh hk 3
                    lvi.SubItems.Add("NULL"); // dim trung binh hk 4


                    lvi.SubItems[indexHocKy].Text = hocsinh.diemTB;

                    lvdshs.Items.Add(lvi);
                    soThuTu++;
                }
            }
        }
        /// <summary>
        /// Load thong tin chung cua hoc sinh bao gom ca diem len listview DSHS
        /// </summary>
        void LoadDSHS_DSHS()
        {
            DShocsinhBLL hocSinhbll = new DShocsinhBLL();
            List <ThongTinChungHS_DiemTB> listThongTinChungHocSinh;

            if (cbTieuChiTimKiem.SelectedIndex == 0)
            {
                listThongTinChungHocSinh = hocSinhbll.GetDanhSachHocSinh_ThongTinChung_TimKiemTheoTen(tbTuKhoaTimKiem.Text);
            }
            else
            if (cbTieuChiTimKiem.SelectedIndex == 2)
            {
                try
                {
                    string[] listdiem = tbTuKhoaTimKiem.Text.Split(' ');
                    float    canTren  = float.Parse(listdiem[1]);
                    float    canDuoi  = float.Parse(listdiem[0]);
                    listThongTinChungHocSinh = hocSinhbll.GetDanhSachHocSinh_ThongTinChung_TimKiemTheoDiemTB(canDuoi, canTren);
                }
                catch
                {
                    MessageBox.Show("Không đúng định dạng tìm kiếm", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    return;
                }
            }
            else
            //  if (cbTieuChiTimKiem.SelectedIndex == 1)
            {
                listThongTinChungHocSinh = hocSinhbll.GetDanhSachHocSinh_ThongTinChung_TimKiemTheoLop(tbTuKhoaTimKiem.Text);
            }

            lvdshs.Items.Clear();
            int          soThuTu   = 1;
            HocKyBLL     hockybll  = new HocKyBLL();
            List <HocKy> listhocky = hockybll.GetListHocKy();

            foreach (ThongTinChungHS_DiemTB hocsinh in listThongTinChungHocSinh)
            {
                int indexHocKy = 0;
                for (int i = 0; i < listhocky.Count; i++)
                {
                    if (listhocky[i].MaHocKy == hocsinh.maHocKy)
                    {
                        indexHocKy = i + 4;
                    }
                }

                bool kiemTraTonTai = false;
                if (lvdshs.Items.Count > 0)
                {
                    foreach (ListViewItem lvitem in lvdshs.Items)
                    {
                        if (lvitem.SubItems[1].Text == hocsinh.maHocSinh)
                        {
                            kiemTraTonTai = true;
                            lvitem.SubItems[indexHocKy].Text = hocsinh.diemTB;
                            break;
                        }
                    }
                }

                if (!kiemTraTonTai)
                {
                    ListViewItem lvi = new ListViewItem(soThuTu + "");
                    lvi.SubItems.Add(hocsinh.maHocSinh);
                    lvi.SubItems.Add(hocsinh.TenHocSinh);
                    lvi.SubItems.Add(hocsinh.Lop);
                    lvi.SubItems.Add("-"); // diem tb hoc ki 1
                    lvi.SubItems.Add("-"); // dim trung binh hk 2
                    lvi.SubItems.Add("-"); // dim trung binh hk 3
                    lvi.SubItems.Add("-"); // dim trung binh hk 4


                    lvi.SubItems[indexHocKy].Text = hocsinh.diemTB;

                    lvdshs.Items.Add(lvi);
                    soThuTu++;
                }
            }
        }