private void btThem_Click(object sender, EventArgs e) { string ma, ho, ten, cmnd, dc, sdt; DateTime ngaysinh; ma = txtMaKH.Text.Trim(); ho = txtHoKH.Text.Trim(); ten = txtTenKH.Text.Trim(); ngaysinh = Convert.ToDateTime(dtpNgaySinh.Text); cmnd = txtCMND.Text.Trim(); dc = txtDiaChi.Text.Trim(); sdt = txtSDT.Text.Trim(); DTOKhachHang kh = new DTOKhachHang(ma, ho, ten, ngaysinh, cmnd, dc, sdt); try { int i = new BUSKhachHang().Add(kh); dgvThemKH.DataSource = GetKH(); load(); dgvXoaKH.DataSource = GetKH(); xoatrangKH(); } catch (SqlException ex) { MessageBox.Show(ex.Message); } }