gridview内实现文件下载

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gridview内实现文件下载
实现起来有点迷惑性，用了几种方法，最后用a实现。

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

<div>

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:testConnectionString %>"

SelectCommand="SELECT * FROM [files]"></asp:SqlDataSource>

</div>

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataSourceID="SqlDataSource1">

<asp:BoundField DataField="id" HeaderText="id" SortExpression="id" />

<asp:BoundField DataField="upload_file" HeaderText="upload_file"
SortExpression="upload_file" />

<asp:BoundField DataField="file_name" HeaderText="file_name"
ortExpression="file_name" />

<asp:TemplateField><ItemTemplate>

<a href='<%#DataBinder.Eval(Container.DataItem,"file_name")%>' target="_blank">下载</a>

</Itemtemplate></asp:TemplateField>

</Columns>

</asp:GridView>

</form>

</body>

</html>