控件使用问题

我需要用listbox控件，显示符合dropdownlist控件或textbox控件中的值的条件，请问如何设置 
比如我可以通过dropdownlist控件选择AA，然后在listbox中列出AA 下面的AA1 AA2 AA3 
也可以直接输入AA 然后在listbox中显示AA1 AA2 AA3 
使用2种方法中的一种即可 表如下 
AA---AA1 
    AA2 
    AA3 
BB---BB1 
    BB2 
    BB3 
vs2008+SQL2008
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="App_User_test" %><!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>Untitled Page</title>
    <style type="text/css">
        .style1
        {
            width: 100%;
        }
        .style2
        {
            width: 73px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    选择系列：<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" 
        DataSourceID="SqlDataSource1" DataTextField="mingcheng" 
        DataValueField="mingcheng">
    </asp:DropDownList>
        手动输入：<asp:TextBox ID="TextBox1" runat="server" 
            ontextchanged="TextBox1_TextChanged" Width="83px"></asp:TextBox>
        <br />
    <br />
    <br />
    <br />
    <br />
    <p>
        <table class="style1">
            <tr>
                <td valign=top class="style2">
                    选择型号</td>
                <td>
    <asp:ListBox ID="ListBox1" runat="server" AutoPostBack="True" 
        DataSourceID="SqlDataSource2" DataTextField="address" DataValueField="address" 
        Height="241px"></asp:ListBox>
                </td>
            </tr>
            <tr>
                <td class="style2">
                    &nbsp;</td>
                <td>
                    &nbsp;</td>
            </tr>
        </table>
    </p>
    &nbsp;
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:MuserConnectionString2 %>" 
        SelectCommand="SELECT DISTINCT [mingcheng] FROM [test]"></asp:SqlDataSource>
    <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
        ConnectionString="<%$ ConnectionStrings:MuserConnectionString2 %>" 
        
        
        
        SelectCommand="SELECT [mingcheng], [address] FROM [test] WHERE (([mingcheng] = @mingcheng) AND ([address] = @address))">
        <SelectParameters>
            <asp:ControlParameter ControlID="DropDownList1" Name="mingcheng" 
                PropertyName="SelectedValue" Type="String" />
            <asp:ControlParameter ControlID="TextBox1" Name="address" PropertyName="Text" 
                Type="String" />
        </SelectParameters>
    </asp:SqlDataSource>
        </form>
</body>
</html>