I have a link in Master page within a div tag. I want to highlight the div when I am clicking the link, in order to redirect to some content page. I have written the following code:

<li>
    <div id="div_test" runat="server">
        <asp:LinkButton ID="lnk_test_menu" Font-Underline="false" 
            ForeColor="Black" runat="server" Text="Test Link"
            CausesValidation="false" onclick="lnk_test_menu_Click1" >
            </asp:LinkButton></div>
</li>

Code in the cs page:

   protected void lnk_test_menu_Click1(object sender, EventArgs e)
   {
        div_test.Attributes.Add("class", "testSelected"); 
        Response.Redirect(Test.aspx");

   }

The div in the master page is not being selected on redirection. Could anybody help me on this?