private void LuuThongTinKhachHang()
{
DBKhachHang dbKH = new DBKhachHang();
DateTime? dt = null;
maKH = dbKH.SetNewPrimaryKey();
dbKH.InsertCustomer(maKH, tenKH, dt, "", "", "", "3");
}
private void btnThem_Click(object sender, EventArgs e)
{
isInsert = true;
txtSDT.ResetText();
txtDiaChi.ResetText();
txtTenKH.ResetText();
grThongTinKhachHang.Enabled = true;
btnHuy.Enabled = true;
btnLuu.Enabled = true;
btnThem.Enabled = false;
btnSua.Enabled = false;
this.ActiveControl = txtTenKH;
txtMaKH.Text = dbKH.SetNewPrimaryKey();
}