将下拉列表绑定到详细信息视图的下载列表ASP.NET C#

我正在尝试将Dropdownlist绑定到页面中的Detailsview控件,其中第二个Dropdownlist的结果取决于第一个Dropdownlist.我可以将单个Dropdownlist绑定到Detailsview,但如果我添加另一个Dropdownlist,其结果取决于第一个,除非您刷新页面,否则详细信息视图不会显示任何内容.

那么,如果选择了第二个下拉列表,我是否可以自动发布detailsview的结果？我目前正在学习this,但我无法得到它.

这是我的示例代码

<%@ Page Title="" Language="C#" MasterPageFile="~/Site1.Master" AutoEventWireup="true" CodeBehind="Search.aspx.cs" Inherits="LibrarySystem.Member.Search" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <h3>
        Search</h3>
    <p>
        Choose a category
        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" 
            DataSourceID="categoryDataSource" DataTextField="name" 
            DataValueField="categoryid">
        </asp:DropDownList>
        <asp:SqlDataSource ID="categoryDataSource" runat="server" 
            ConnectionString="<%$ConnectionStrings:LibrarySystemConnectionString %>" 
            SelectCommand="SELECT categoryid,name FROM dbo.TblCategory">
        </asp:SqlDataSource>
    </p>
    <p>
        Choose a title
        <asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True" 
            DataSourceID="bookDataSource" DataTextField="booktitle" DataValueField="bookid">
        </asp:DropDownList>
        <asp:SqlDataSource ID="bookDataSource" runat="server" 
            ConnectionString="<%$ConnectionStrings:LibrarySystemConnectionString %>" 

            SelectCommand="SELECT [categoryid],[booktitle],[bookid] FROM [TblBooks] WHERE ([categoryid] = @categoryid)">
            <SelectParameters>
                <asp:ControlParameter ControlID="DropDownList1" Name="categoryid" 
                    PropertyName="SelectedValue" Type="Int32" />
            </SelectParameters>
        </asp:SqlDataSource>
    </p>
    <p>
        <asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" 
            CellPadding="4" DataKeyNames="bookid" DataSourceID="bookdetailsDataSource" 
            ForeColor="#333333" GridLines="None">
            <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
            <CommandRowStyle BackColor="#D1DDF1" Font-Bold="True" />
            <RowStyle BackColor="#EFF3FB" />
            <FieldHeaderStyle BackColor="#DEE8F5" Font-Bold="True" />
            <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
            <Fields>
                <asp:BoundField DataField="bookid" HeaderText="ID/ISBN" ReadOnly="True" 
                    SortExpression="bookid" />
                <asp:BoundField DataField="booktitle" HeaderText="Title" 
                    SortExpression="booktitle" />
                <asp:BoundField DataField="lastname" HeaderText="Author" 
                    SortExpression="lastname" />
                <asp:BoundField DataField="firstname" HeaderText="" 
                    SortExpression="firstname" />
                <asp:BoundField DataField="description" HeaderText="Description" 
                    SortExpression="description" />
                <asp:BoundField DataField="name" HeaderText="Category" SortExpression="name" />
                <asp:BoundField DataField="dateadded" HeaderText="Date added" 
                    SortExpression="dateadded" />
                <asp:BoundField DataField="quantity" HeaderText="No. of copies" 
                    SortExpression="quantity" />
                <asp:BoundField DataField="EmployeeID" HeaderText="Reserved by" 
                    SortExpression="EmployeeID" />
                <asp:BoundField DataField="reservedate" HeaderText="Reserved date" 
                    SortExpression="reservedate" />
                <asp:BoundField DataField="statusname" HeaderText="Status" 
                    SortExpression="statusname" />
            </Fields>
            <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
            <EditRowStyle BackColor="#2461BF" />
            <AlternatingRowStyle BackColor="White" />
        </asp:DetailsView>

任何帮助将非常感激

（编辑：李大同）

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