repeater数据不显示，求大神们帮一下解决思路

repeater数据不显示，求大神们帮一下
Default.aspx.cs：
    if (Session["yhm"] ==null)
        {
          Response.Redirect("login.aspx");
          
        }
        List<News> result = new List<News>();
        Userbll ub = new Userbll();
        result = ub.GetTop15();
        if (result.Count > 0)
        {
            Repeater1.DataSource = result;
            Repeater1.DataBind();
        }
Default.aspx：
<asp:Repeater ID="Repeater1" runat="server">
                        <ItemTemplate>
                            <ul>
                                <li><a href='<%#Eval("NEWSID","shownews.aspx?id={0}") %>'><%# Eval("NEWSTITLE")%></a></li>
                            </ul>
                        </ItemTemplate>
                    </asp:Repeater>
Userbll.cs：

  public List<News> GetTop15()
    {
        List<News> result = new List<News>();
        conn = new SqlConnection(DBhelp.StrConn);
        try
        {
            conn.Open();
            DBnews nd = new DBnews(conn, tran);
            result = nd.SelectTop15();
            conn.Close();
        }
        catch (Exception ex)
        {
            result = new List<News>();
        }
        finally
        {
            if (tran != null)
            {
                tran.Dispose();
            }
            conn.Dispose();
        }
        return result;
    }
DBnews.cs：

 private string selectTop15News = @"select top 15 *  from [news]";//数据库没有问题，我在数据库里可以查出15条记录
    /// <summary>
    /// 显示前15条记录
    /// </summary>
    /// <returns></returns>
    public List<News> SelectTop15()
    {
        List<News> result = new List<News>();
        SqlCommand comm = new SqlCommand();
        SqlDataReader dr = null;
        try
        {
            comm.CommandText =selectTop15News;
            comm.Connection = conn;
            comm.Transaction = tran;
            dr = comm.ExecuteReader();
            while (dr.Read())
            {
                News n = new News();