private void btnThemNV_Click(object sender, EventArgs e)
        {
            Form_ThemNhanVien openForm = new Form_ThemNhanVien();

            openForm.Mode = mode;
            if (openForm.ShowDialog() == DialogResult.OK)
            {
                NhanVien_BUS.ThemNhanVien(openForm.NhanVien, maNH);
                LoadForm();
            }
        }
 private void btnThemNV_Click(object sender, EventArgs e)
 {
     Form_ThemNhanVien openForm = new Form_ThemNhanVien();
     openForm.Mode = mode;
     if (openForm.ShowDialog() == DialogResult.OK)
     {
        NhanVien_BUS.ThemNhanVien(openForm.NhanVien,maNH);
        LoadForm();
     }
 }