private void btnTraCuuTTDK_act_Click(object sender, EventArgs e) { groupBoxTraCuuTTDK.Visible = true; groupBoxTraCuuDiem.Visible = false; panelQT.Visible = false; panel_CapNhatSLLop.Visible = false; gbxCapNhatSLLop.Visible = false; panel_CapNhatSLSV_N.Visible = false; gbxCapNhatSLSV.Visible = false; panelThemDead.Visible = false; gbxThemDead.Visible = false; panel_CapNhatDead.Visible = false; gbxCapNhatDead.Visible = false; panel_KhaNang.Visible = false; gbxKhaNang.Visible = false; panel_TraCuuDiem.Visible = false; panelTraCuuTTDK.Visible = true; panelChinh.Visible = false; if (cbxHocKiTTDK.Text == "" || cbxNamHocTTDK.Text == "") { MessageBox.Show("Bạn vui lòng chọn đủ thông tin!"); return; } BUSGiaoVien tt = new BUSGiaoVien(); DataTable dt = tt.LayThongTinDangKy(cbxMaChuyenDeTTDK.Text, cbxNamHocTTDK.Text, Convert.ToInt32(cbxHocKiTTDK.Text), IDNguoiDung); dataGridViewTraCuuTTDK.DataSource = dt; }