private void btnThem_Click(object sender, EventArgs e)
{
if (KiemTraDuLieu())
{
BUS_HangHoa h = new BUS_HangHoa();
var flag = h.ThemHangHoa(txtTenHangHoa.Text, int.Parse(cbDVT.EditValue.ToString()), int.Parse(txtSoLuong.Text), float.Parse(txtDonGia.Text));
if (flag == true)
{
var tb = MessageBox.Show("Bạn đã thêm hàng hóa thành công.", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Information);
if (tb == DialogResult.OK)
{
txtTenHangHoa.Text = string.Empty;
cbDVT.EditValue = null;
txtSoLuong.Text = string.Empty;
txtDonGia.Text = string.Empty;
KhiThemHangHoa(EventArgs.Empty); // https://msdn.microsoft.com/en-us/library/9aackb16(v=vs.110).aspx
}
}
}
}