asp.net link button not working properly

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ASP.NET

<%@ Page Title="" Language="C#" MasterPageFile="~/Ui/MasterPage_UI.master" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Ui_Default2" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<div class="content"  runat="server">
<p>
I am a returning customer</p>
E-Mail Address:<br />
    <asp:TextBox name="email" runat="server" ID="email" 
    ValidationGroup="email" ></asp:TextBox>
    <br />
    <br />
    Password:<br />
    <asp:TextBox  ID="pwd" runat="server" name="password" TextMode="Password"></asp:TextBox>
    <br />
    <br />
    <asp:LinkButton ID="Submit" runat="server" CssClass="button" onclick="Submit_Click" Text="Login" 
    ValidationGroup="email" />
</div>

</asp:Content>

the dynamicly generated menu's aspx code is-->

<div class="set-size"  runat="server">
	
    <div class="categories"  runat="server">
    <ul  runat="server" id="nav">
    <li class="home" style="background-repeat: no-repeat; background-color: #94C23C; background-image: removed(home.jpg); background-removed: center;"><a href="index.htm">Home</a></li>
    <!--Dynamic menu-->
    </ul>
    </div>
	</div>

and thye cs code is-->

public void bindmenu()
    {
        HtmlGenericControl li;
        HtmlAnchor link;
        HtmlGenericControl div;

        //for main menu
        DataTable dt = new BALCate().GetCate();
        foreach (DataRow dr in dt.Rows)
        {
            int cateid = int.Parse(dr["cate_id"].ToString());
            String cate_name = dr["cate_name"].ToString();
            li = new HtmlGenericControl("li");
            link = new HtmlAnchor();
            link.InnerText = dr["cate_name"].ToString();
            link.HRef = "CateProducts.aspx?cate_id=" + cateid + "&" + "catename=" + cate_name;
            li.Controls.Add(link);

            //for submenu
            DataTable subcate = new BALCate().GetSubCate(cateid);
            if (subcate.Rows.Count > 0)
            {
                div = new HtmlGenericControl("div");
                div.Attributes.Add("class", "sub-menu column-1");
                HtmlGenericControl sul = new HtmlGenericControl("ul");

                foreach (DataRow sdr in subcate.Rows)
                {
                    int subcateid = int.Parse(sdr["subcate_id"].ToString());
                    String subcatename = sdr["subcate_name"].ToString();
                    HtmlGenericControl sli = new HtmlGenericControl("li");
                    HtmlAnchor slink = new HtmlAnchor();
                    slink.InnerHtml = sdr["subcate_name"].ToString();
                    sli.Controls.Add(slink);
                    slink.HRef = "SubCateProducts.aspx?subcate_id=" + subcateid + "&" + "catename=" + cate_name + "&" + "subcatename=" + subcatename;
                    sul.Controls.Add(sli);

                    DataTable subsubcate = new BALCate().GetSubSubCate(subcateid);
                    if (subsubcate.Rows.Count > 0)
                    {
                        HtmlGenericControl subdiv = new HtmlGenericControl("div");
                        subdiv.Attributes.Add("class", "sub-menu");
                        HtmlGenericControl ssul = new HtmlGenericControl("ul");

                        foreach (DataRow ssdr in subsubcate.Rows)
                        {
                            int subsubcateid = int.Parse(ssdr["subsubcate_id"].ToString());
                            String subsubcatename = ssdr["subsubcate_name"].ToString();
                            HtmlGenericControl ssli = new HtmlGenericControl("li");
                            HtmlAnchor sslink = new HtmlAnchor();
                            sslink.HRef = "SubSubCateProducts.aspx?subsubcate_id=" + subsubcateid + "&" + "catename=" + cate_name + "&" + "subcatename=" + subcatename + "&" + "subsubcatename=" + subsubcatename;
                            sslink.InnerText = ssdr["subsubcate_name"].ToString();
                            ssli.Controls.Add(sslink);
                            ssul.Controls.Add(ssli);
                        }
                        subdiv.Controls.Add(ssul);
                        sli.Controls.Add(subdiv);
                    }
                }
                div.Controls.Add(sul);
                li.Controls.Add(div);
            }
            nav.Controls.Add(li);
        }
    }

actually there is also a master page, which contains DYNAMIC MENU in which data(categories and subcategories) dynamicly loaded from the database at the time of the pageload. but the iissue is that whenever i clicking on the link button , the menu doesnt retrieve the data from the database and appears blank with the remaining static part of it.