private void bindingNavigatorAddNewItem_Click(object sender, EventArgs e)
{
if (dGVKhachHang.RowCount == 0)
{
bindingNavigatorDeleteItem.Enabled = true;
}
DataRow m_Row = m_KhachHangCtrl.ThemDongMoi();
m_Row["MaKH"] = "KH" + dGVKhachHang.Rows.Count + 1;
m_Row["TenKH"] = "";
m_Row["SDT"] = "";
m_Row["DiaChi"] = "";
m_KhachHangCtrl.ThemNguoiDung(m_Row);
bindingNavigatorKhachHang.BindingSource.MoveLast();
}
