private void tbnThem_Click(object sender, EventArgs e) { if (btnTV.Enabled == false) { this.tbnSua.Enabled = false; this.tbnXoa.Enabled = false; this.tbnGiaHan.Enabled = false; enableInput(); btnTV.Enabled = true; clearInput(); } else { HopDong temp = new HopDong(txtMaHD.Text, txtTenHD.Text, txtMaNV.Text, dateBD.Value, dateKT.Value); ConnectDatabase.ThemHopDong(temp); dgvHienThi.DataSource = ConnectDatabase.getAllHopDong(); clearInput(); } }