求助~~~~~~~~~~

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="BooklList.aspx.cs" Inherits="Default2" Title="无标题页" %><asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
        <asp:DataList ID="DataList1" runat="server" Width="780px">
            <SeparatorTemplate>
                &lt;hr&gt;&lt;/hr&gt;
            </SeparatorTemplate>
            <ItemTemplate>
                <table border="0" width="100%">
                    <tr>
                        <td rowspan="3" width="9%">
                            <a href="Default.aspx?id=<%# Eval("Id") %>"><img height="120" src="<%# GetUrl(Eval("ISBN").ToString())%>" width="95" /></a></td>
                  <td width="91%">
                     <%# Eval("title") %></td>
                    </tr>
                    <tr>
                        <td>
                            <%#Eval("Author") %></td>
                    </tr>
                    <tr>
                        <td>
                           <%# GetCut(Eval("ContentDescription").ToString(),150) %></td>
                    </tr>
                    <tr>
                        <td colspan="2">
                            <div align="right">
                               <%# Eval("unitPrice") %>></div>
                        </td>
                    </tr>
                </table>
            </ItemTemplate>
        </asp:DataList>
    <br />
</asp:Content>提示上下文中没有GETURL 和GETCUT 
我是不是差什么东西没引用？？还是有其他的原因？？