点击UltraWebGrid单元格中的链接，下载文件

<mce:script type="text/javascript"><!--
function Download(fileID) {
    __doPostBack('<%= LinkButton1.ClientID %>', '');
}
// --></mce:script>
<!--注意，切不可放在updatepanel中 -->
<asp:LinkButton ID="LinkButton1" runat="server" onclick="LinkButton1_Click"></asp:LinkButton>

后台

        protected void Grid_InitializeRow(object sender, RowEventArgs e)
        {
            string fullpath = "";
            if (String.IsNullOrEmpty(e.Row.Cells[9].Text))
                return;
             fullpath = ContextHelper.GetUploadFileURL(e.Row.Cells[9].Text);
             state.DownLoadFileGuid = e.Row.Cells[9].Text;
             state.FileName = e.Row.Cells[10].Text;
             state.Save(Session);
             e.Row.Cells[10].Value = (String.IsNullOrEmpty(e.Row.Cells[10].Text)) ?
                 null : "<a href="#" mce_href="#" onclick=Download('" + e.Row.Cells[9].Text + "'); title='" + e.Row.Cells[10].Text + "'>" + e.Row.Cells[10].Text + "</a>";
        }

        protected void LinkButton1_Click(object sender, EventArgs e)
        {
            Response.ContentType = "application/octet-stream";
            //通知浏览器下载文件而不是打开 
            Response.AddHeader("Content-Disposition",
                               "attachment; filename=" +
                               HttpUtility.UrlEncode(state.FileName,
                                                     System.Text.Encoding.UTF8));
            Response.BinaryWrite(
                ContextHelper.GetUploadFileData(state.DownLoadFileGuid));
            Response.Flush();
            Response.End();
        }

其中state是自己封装的session类，实际跟session[XX]=XX的操作是一样的,ContextHelper.GetUploadFileData也是自己实现的类，功能是返回文件的二进制数据