Code
<table width="100%" cellpadding="0" cellspacing="0" border="0">
      <tr>
      <td style="height:500px; vertical-align:top">
     <asp:Label ID="LabTypeNull" runat="server" Visible="false" ForeColor="Red" 

Text="未添加产品，请管理员至后台添加"></asp:Label>
           <asp:PlaceHolder ID="PHproduct" runat="server">
                </asp:PlaceHolder>
                      </td>
                 </tr>
          </table>

Code
protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            OleDbConnection conn = new OleDbConnection(System.Configuration.ConfigurationManager.ConnectionStrings["TOPDB"].ToString());
            OleDbCommand cmd = new OleDbCommand("select count(*) from ProductType", conn);
            conn.Open();
            int TypeNull = (int)cmd.ExecuteScalar();
            conn.Close();
            if (TypeNull == 0)
            {
                LabTypeNull.Visible = true;
            }
            else
            {
                OleDbCommand Typecmd = new OleDbCommand("select * from ProductType", conn);
                conn.Open();
                OleDbDataReader TypeDr = Typecmd.ExecuteReader();
                while (TypeDr.Read())
                {
                    TabContainer tabcon = new TabContainer();

                    Literal lit = new Literal();
                    string s = string.Format("<div class='divcss'>{0}</div>", TypeDr["TypeName"].ToString());
                    lit.Text = s;

                    //依据TabContainer的ID动态添加TabPanel
                    OleDbCommand List = new OleDbCommand("select top 5 * from TypeList where TypeID=" + TypeDr["ID"] + "", conn);
                    OleDbDataReader ListDr = List.ExecuteReader();
                    while (ListDr.Read())
                    {
                        TabPanel Tab = new TabPanel();
                        Tab.HeaderText = ListDr["TypeListName"].ToString();
                        Panel Pan = new Panel();
                        UserControl uc = (UserControl)Page.LoadControl("ascx/ProductList.ascx");
                        uc.Attributes["ID"] = ListDr["ID"].ToString();
                        Pan.Controls.Add(uc);
                        TabContentTemplate temp = new TabContentTemplate();
                        temp.SetTemplate(Pan);
                        Tab.ContentTemplate = temp;
                        tabcon.Controls.Add(Tab);
                    }
                    tabcon.CssClass = "AjaxTabStrip";
                    PHproduct.Controls.Add(lit);
                    PHproduct.Controls.Add(tabcon);
                }
                conn.Close();

            }
        }
    }

    public class TabContentTemplate : ITemplate
    {
        private Control _template;

        public void SetTemplate(Control templateControl)
        {
            _template = templateControl;
        }

        ITemplate Members;

        public void InstantiateIn(Control container)
        {
            container.Controls.Add(_template);
        }


    }