Datalist绑定数据时使用条件判断！

     有时候绑定数据时会需要做些判断，可以使用以下方法判断条件！

<asp:DataList ID="DataList2" runat="server" RepeatColumns="4" Width="100%" RepeatDirection="Horizontal">
                    <ItemStyle Width="500px" Height="110px" />
                    <ItemTemplate>
                        <table style="margin-top: 10px">
                            <tr>
                                <td>
                                    <a target="_blank" href='ProductDetail.aspx?productID=<%#Eval("ProductID") %>'>
                                        <img src='<%#"../images/"+Eval("Image").ToString().Substring(0,Eval("Image").ToString().IndexOf("|"))+".jpg" %>'
                                            width="140px" height="150px" border="0">
                                    </a>&nbsp;
                                </td>
                            </tr>
                            <tr>
                                <td align="left" style="height: 40px" valign="top">
                                    <a target="_blank" href='ProductDetail.aspx?productID=<%#Eval("ProductID") %>'>
                                        <%#Eval("Title") %></a>
                                </td>
                            </tr>
                            <tr>
                                <td align="left">
                                    本店价：<font color="blue"><asp:Label ID="lblPrice" runat="server" Text='<%#Eval("Price").ToString() %>'></asp:Label>元</font>
                                </td>
                            </tr>
                            <tr>
                                <td align="left">
                                    会员价：<font color="red"><%if (User.Identity.IsAuthenticated)
                                                            { %>
                                        <%#Eval("MemberPrice") %>
                                        <% }
                                                            else
                                                            {%>
                                        <%#Convert.ToInt32(Eval("Price"))*0.9 %>
                                        <% }%>元 </font>
                                </td>
                            </tr>
                        </table>
                    </ItemTemplate>
                </asp:DataList>