如何在FormView中实现DropDownList连动选择

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="X200906111015.aspx.cs" Inherits="DropDown_X200906111015" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title></title></head><body>    <form id="form1" runat="server">    <div>        <asp:FormView ID="FormView1" runat="server" AllowPaging="True"             onpageindexchanging="FormView1_PageIndexChanging"             DataKeyNames="ProductKey" >            <ItemTemplate>                ProductKey:<asp:Label ID="fProductKey" Text='<%#Eval("ProductKey")%>' runat="server"></asp:Label>                <br />                Name: <asp:Label ID="fProductName" Text='<%#Eval("Name")%>' runat="server"></asp:Label>                <br />                ProductClass:                <asp:DropDownList ID="fProductClass" runat="server" AutoPostBack="True"                     OnInit="InitProductClass" OnSelectedIndexChanged="ProductClass_SelectedIndexChanged">                </asp:DropDownList>                <br />                ProductSubClass:                <asp:DropDownList  ID="fProductSubClass" runat="server">                </asp:DropDownList>                <br />            </ItemTemplate>        </asp:FormView>    </div>    </form></body></html>

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using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Data;using System.Drawing;/// <summary>/// 标题：FormView DropList 连动简单示例/// 日期：2009-06-11/// </summary>public partial class DropDown_X200906111015 : System.Web.UI.Page{    private DataTable Product    {        get        {            if (Session["Product"] == null)            {                DataTable fProduct = new DataTable();                fProduct.Columns.Add(new DataColumn("ProductKey", typeof(int)));                 fProduct.Columns.Add(new DataColumn("ProductClassKey", typeof(int)));                 fProduct.Columns.Add(new DataColumn("Name", typeof(string)));                 fProduct.Rows.Add(new object[] { 1, 1, "产品一" });                fProduct.Rows.Add(new object[] { 2, 2, "产品二" });                fProduct.Rows.Add(new object[] { 3, 3, "产品三" });                Session["Product"] = fProduct;            }            return (DataTable)Session["Product"];        }    }    private DataTable ProductClass    {        get        {            if (Session["ProductClass"] == null)            {                DataTable fProductClass = new DataTable();                fProductClass.Columns.Add(new DataColumn("ProductClassKey", typeof(int)));                 fProductClass.Columns.Add(new DataColumn("Name", typeof(string)));                 fProductClass.Rows.Add(new object[] { 1, "能源" });                fProductClass.Rows.Add(new object[] { 2, "办公" });                fProductClass.Rows.Add(new object[] { 3, "食品" });                Session["ProductClass"] = fProductClass;            }            return (DataTable)Session["ProductClass"];        }    }    private DataTable ProductSubClass    {        get        {            if (Session["ProductSubClass"] == null)            {                DataTable fProductSubClass = new DataTable();                fProductSubClass.Columns.Add(new DataColumn("ParentProductClassKey", typeof(int)));                 fProductSubClass.Columns.Add(new DataColumn("Name", typeof(string)));                 fProductSubClass.Rows.Add(new object[] { 1, "石油" });                fProductSubClass.Rows.Add(new object[] { 1, "煤" });                fProductSubClass.Rows.Add(new object[] { 2, "打印机" });                fProductSubClass.Rows.Add(new object[] { 2, "办公桌" });                fProductSubClass.Rows.Add(new object[] { 3, "朱奶" });                fProductSubClass.Rows.Add(new object[] { 3, "面包" });                Session["ProductSubClass"] = fProductSubClass;            }            return (DataTable)Session["ProductSubClass"];        }    }    protected void Page_Load(object sender, EventArgs e)    {        if (!IsPostBack)            this.BindFormView();    }    private void BindFormView()    {        this.FormView1.DataSource = this.Product;        this.FormView1.DataBind();    }    protected void InitProductClass(object sender, EventArgs e)    {        DropDownList fDropDownList = (DropDownList)sender;        FormViewRow fFormViewRow = (FormViewRow)fDropDownList.Parent.Parent;        fDropDownList.DataTextField = "Name";        fDropDownList.DataValueField = "ProductClassKey";        fDropDownList.DataSource = this.ProductClass;        fDropDownList.DataBind();                DataRowView fDataRowView = (DataRowView)this.FormView1.DataItem;        if (fDataRowView != null)             fDropDownList.SelectedValue = fDataRowView["ProductClassKey"].ToString();    }    protected void ProductClass_SelectedIndexChanged(object sender, EventArgs e)    {        DropDownList fProductClassList = (DropDownList)sender;        FormViewRow fFormViewRow = (FormViewRow)fProductClassList.Parent.Parent;        DropDownList fProductSubClassList = (DropDownList)fFormViewRow.FindControl("fProductSubClass");        DataView fDataView = this.ProductSubClass.DefaultView;        fDataView.RowFilter = string.Format("ParentProductClassKey = {0}", fProductClassList.SelectedValue);        fProductSubClassList.DataTextField = "Name";        fProductSubClassList.DataValueField = "ParentProductClassKey";        fProductSubClassList.DataSource = fDataView;        fProductSubClassList.DataBind();    }    protected void FormView1_PageIndexChanging(object sender, FormViewPageEventArgs e)    {        this.FormView1.PageIndex = e.NewPageIndex;        this.BindFormView();    }}