private void LoadDuLieu() { dgvHocSinh.DataSource = HocSinhDAO.LoadDataHocSinh(); cboLop.DataSource = LopDAO.LoadDataLop1(); cboLop.ValueMember = "IDLop"; cboLop.DisplayMember = "TenLop"; AutoCompleteStringCollection ac = new AutoCompleteStringCollection(); DataTable dt = (DataTable)dgvHocSinh.DataSource; for (int i = 0; i < dt.Rows.Count; i++) { ac.Add(dt.Rows[i][1].ToString()); } txtTimKiem.AutoCompleteCustomSource = ac; ReadOnly(); }