How to make click event with a tag

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ASP.NET

I need to use a tag with click event and the href link I need to write it in code behind
when the link is clicked it will be opened on iframe by writing iframe id in the target of a tag

I tried the code below

please help

What I have tried:

<ul><li><a id="urlbb"   runat="server" >web1</li></ul>
 <asp:PlaceHolder ID="url" runat="server" Visible="false">
 <iframe name="aa" width="100%" height="800px" style="margin-top:50px"></iframe>
              <asp:PlaceHolder ID="mainbody" runat="server" Visible="true">

Code behind

protected void urlbb_ServerClick(object sender, EventArgs e)
   {
       mainbody.Visible = false;
       url.Visible = true;
       urlbb.Target = "aa";
       urlbb.HRef = "http://www.bradford.ac.uk/it-services/students/email/";
   }