Create dynamic Menu using jQuey Ajax in ASP.Net

how can make a dynamic menu bar with sub child using jquery ajax json  and add plus  symbol to open a sub chile 

<ul>
    <li>one</li>
    <li>
        <ul>
            <li>oneA</li>
            <li>oneB</li>
            <li>oneC</li>
        </ul>
    </li>
</ul>