private void BtnNguoiMuonThem_Click(object sender, EventArgs e)
{
FrmNguoiMuonSachThemMoi Frm1 = new FrmNguoiMuonSachThemMoi();
Frm1.Show();
}
private void btnThemMoiNMS_Click(object sender, EventArgs e)
{
FrmNguoiMuonSachThemMoi frm = new FrmNguoiMuonSachThemMoi();
frm.Show();
}