private void btnLap_Click(object sender, EventArgs e) { if (cboTenLop.Text == (string)cboTenLop.SelectedValue) { PhanCongGiangDayBUL phanCongGiangDayBUL = new PhanCongGiangDayBUL(); string TenLop = cboTenLop.Text; DataTable dt = phanCongGiangDayBUL.DSPhanCongGiangDay(TenLop); dgvHT.DataSource = dt; dgvHT.Columns[1].HeaderText = "MaGiaoVien"; dgvHT.Columns[1].Width = 100; dgvHT.Columns[2].HeaderText = "HoTen"; dgvHT.Columns[2].Width = 100; dgvHT.Columns[3].HeaderText = "TenMon"; dgvHT.Columns[3].Width = 100; dgvHT.Columns[4].HeaderText = "NgayphanCong"; dgvHT.Columns[4].Width = 100; dgvHT.Columns[5].HeaderText = "SoDienThoai"; dgvHT.Columns[5].Width = 100; for (int i = 0; i < dgvHT.Rows.Count - 1; i++) { dgvHT.Rows[i].Cells[0].Value = i + 1; } } }