小编Ket*_*tan的帖子

我的DropDownListwebform中有两个s,当我在第一个下拉列表中选择一个值时,我希望在第二个下拉列表中自动选择一个相关值.

这就是我目前拥有的:

    <table>   
        <tr>
            <td>
                <asp:Label ID="lbmanu" runat="server" Text="Furniture Manufacturer : 
                   "></asp:Label>
            </td>
            <td>
                <asp:DropDownList ID="ddmanu" runat="server" 
                    DataSourceID="Sql_fur_model_manu"    
                    DataTextField="manufacturer" DataValueField="manufacturer" 
                    onselectedindexchanged="ddmanu_SelectedIndexChanged">
                </asp:DropDownList>
                <asp:SqlDataSource ID="Sql_fur_model_manu" runat="server" 
                    ConnectionString="<%$ ConnectionStrings:conStr %>" 
                    SelectCommand="SELECT DISTINCT [manufacturer] FROM 
                     [furniture_manufacturer]">
                </asp:SqlDataSource>
            </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lbtype" runat="server" Text="Furniture Type : 
                        "></asp:Label>
            </td>
            <td>
                <asp:DropDownList ID="ddtype" runat="server" AutoPostBack="True">
                   </asp:DropDownList>
            </td>
        </tr>
   </table>

代码背后:

protected void ddmanu_SelectedIndexChanged(object sender, EventArgs e)
{
    string query = "select furniture from furniture_model where manufacturer='" + 
    ddmanu.SelectedValue.ToString() + "'";
    con.Open();
    cmd …