private void cboTimDiaChi_Click(object sender, EventArgs e) { cboTimDiaChi.SelectionStart = cboTimDiaChi.Text.Length; BUS_tblGiaovien busGv = new BUS_tblGiaovien(); DataTable tb = busGv.getField("DiaChi"); cboTimDiaChi.Items.Clear(); cboTimDiaChi.Items.Add("Tất cả"); for (int i = 0; i < tb.Rows.Count; i++) { cboTimDiaChi.Items.Add(tb.Rows[i]["DiaChi"].ToString()); } }