FormView+LinqDataSource的更新代码

我的代码如下，没有cs代码，点击delete和insert都是有反应的，但那是点击update，就直接返回readonly模式了，没有执行任何的数据库操作

<asp:LinqDataSource ContextTypeName="mm.Core.Model.MmDataContext" TableName="Articles"
        ID="LinqDataSource1" EnableUpdate="true" EnableInsert="true" EnableDelete="true"
        runat="server" Where="Id=@Id">
        <WhereParameters>
            <asp:QueryStringParameter Type="Int32" DefaultValue="1" Name="Id" QueryStringField="Id" />
        </WhereParameters>
    </asp:LinqDataSource>
    <asp:FormView ID="FormView1" DataSourceID="LinqDataSource1" AllowPaging="true" runat="server"
        DataKeyNames="Id" onpageindexchanging="FormView1_PageIndexChanging">
        <HeaderStyle ForeColor="white" BackColor="Blue" />
        <ItemTemplate>
            <table>
                <tr>
                    <td align="right">
                        <b>标题</b>
                    </td>
                    <td>
                        <asp:Label ID="lblTitle" runat="server" Text='<%# Eval("Title") %>' />
                    </td>
                </tr>
                <tr>
                    <td colspan="2">
                        <asp:LinkButton ID="EditButton" Text="Edit" CommandName="Edit" runat="server" />

                        <asp:LinkButton ID="NewButton" Text="New" CommandName="New" runat="server" />

                        <asp:LinkButton ID="DeleteButton" Text="Delete" CommandName="Delete" runat="server" />
                    </td>
                </tr>
            </table>
        </ItemTemplate>
        <EditItemTemplate>
            <table>
                <tr>
                    <td align="right">
                        <b>标题</b>
                    </td>
                    <td>
                        <asp:TextBox ID="TextBox1" runat="server" Text='<%# Eval("Title") %>'></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td colspan="2">
                        <asp:LinkButton ID="UpdateButton" Text="Update" CommandName="Update" runat="server" />

                        <asp:LinkButton ID="CancelUpdateButton" Text="Cancel" CommandName="Cancel" runat="server" />
                    </td>
                </tr>
            </table>
        </EditItemTemplate>
        <InsertItemTemplate>
            <table>
                <tr>
                    <td align="right">
                        <b>标题</b>
                    </td>
                    <td>
                        <asp:TextBox ID="TextBox1" runat="server" Text='<%# Eval("Title") %>'></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td colspan="2">
                        <asp:LinkButton ID="InsertButton" Text="Insert" CommandName="Insert" runat="server" />

                        <asp:LinkButton ID="CancelInsertButton" Text="Cancel" CommandName="Cancel" runat="server" />
                    </td>
                </tr>
            </table>
        </InsertItemTemplate>
    </asp:FormView> --------------------编程问答-------------------- d --------------------编程问答-------------------- 翻遍了互联网没有一篇完整介绍formview+linqdatasource的
很无奈。 --------------------编程问答-------------------- d

补充：.NET技术 ,  ASP.NET