Access HTML UL LI tags in Code Behind using C# in ASP.Net

Here I have created sample that hides the ul, li using code behind on page load.

HTML

<div>
    Courses :
    <ul>
        <li id="liDotNet" runat="server">DotNet</li>
        <li id="liJava" runat="server">Java</li>
        <li id="liOracle" runat="server">Oracle</li>
    </ul>
</div>

C#

protected void Page_Load(object sender, EventArgs e)
{
    liJava.Visible = false;
}

Screenshot