private void btnThemKH_Click(object sender, EventArgs e)
{
DataTable datatable_khachhang = bus_khachhang.BangKhachHang();
if (btnThemKH.Text.Contains("Th"))
{
lb_hoantackhachhang.Visible = true;
txtIDKhachHang.Text = (bus_khachhang.currentID() + 1).ToString();
txtHoTenKhachHang.Text = "";
txtSDTKhachHang.Text = "";
dtpkNamSinhKhachHang.DataBindings.Clear();
dtpkNamSinhKhachHang.Text = "";
btnThemKH.Text = "Luu";
}
if (txtHoTenKhachHang.Text != "")
{
String tenkh = txtHoTenKhachHang.Text;
String sdtkh = txtSDTKhachHang.Text;
String namsinh = dtpkNamSinhKhachHang.Value.ToString("yyyy-MM-dd");
String ngaytao = DateTime.Now.ToString("yyyy-MM-dd");
KhachHang khachhang = new KhachHang(-1, tenkh, sdtkh, namsinh, ngaytao);
MessageBox.Show(bus_khachhang.LuuBangKhachHang(khachhang));
DLTrenTungTrang_KhachHang();
btnThemKH.Text = "Thêm";
lb_hoantackhachhang.Visible = false;
}
}