服务器标记的格式不正确(第5行)
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="SectionLevelTutorialListing.ascx.cs" Inherits="UserControls_SectionLevelTutorialListing" %>
 <asp:Repeater ID="TutorialList" runat="server" EnableViewState="False">
  <HeaderTemplate><ul></HeaderTemplate>
  <ItemTemplate>
  <li><asp:HyperLink ID="HyperLink1" runat="server"
  NavigateUrl="<%# Eval("Url") %>" Text="<%# Eval("Title")
  %>"></asp:HyperLink>
  - <%# Eval("Description") %></li>
  </ItemTemplate>
  <FooterTemplate></ul></FooterTemplate>
</asp:Repeater>

------解决方案--------------------
外层用单引号来括里面Eval("***")的双引号
------解决方案--------------------

HTML code

<asp:Repeater ID="TutorialList" runat="server" EnableViewState="False"> 
    <HeaderTemplate> <ul> </HeaderTemplate> 
    <ItemTemplate> 
        <li> <asp:HyperLink ID="HyperLink1" runat="server" 
          NavigateUrl=' <%# Eval("Url") %>' Text=' <%# Eval("Title") 
          %>'> </asp:HyperLink> 
                - <%# Eval("Description") %> </li> 
    </ItemTemplate> 
    <FooterTemplate> </ul> </FooterTemplate> 
</asp:Repeater>