大神求指教！关于c#的文件下载。

Answer 1

<a href="file/121.txt">下载</a>

Answer 2

这是我的前台代码：
 <asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" OnSelectedIndexChanged="GridView1_SelectedIndexChanged"
                        Width="685px">
                        <Columns>
                            <asp:ButtonField CommandName="Cancel" HeaderText="下载" ShowHeader="True" Text="下载" />
                        </Columns>
                    </asp:GridView>
                    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:zuoyeConnectionString %>"
                        SelectCommand="SELECT * FROM [wjsc]"></asp:SqlDataSource>
请问把<a href="file/121.txt">下载</a>放在哪里？