导出GridView中的数据

Question

我在导出GridView中的数据时用的是如下方法，但如果有图片时，却打印不出来，求高手解决一下，

怎么才能解决这个问题。我想了一下可能要把输出流转换成二进制流才可以。

 protected void Button_print_Click(object sender, EventArgs e)
    {
        System.Web.HttpContext HC = System.Web.HttpContext.Current;
        HC.Response.Clear();
        HC.Response.Charset = "GB2312";
        HC.Response.Buffer = true;
        HC.Response.ContentEncoding = System.Text.Encoding.UTF7;
        HC.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode("查询结果打印", System.Text.Encoding.UTF8) + ".doc");
        HC.Response.ContentType = "application/ms-word";//如果要打印为excel格式，则换为"application/excel"
        this.EnableViewState = false;
        System.IO.StringWriter sw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);
        this.GV_result.RenderControl(htw);
        HC.Response.Write(sw.ToString());
        HC.Response.End();
    }//打印输出按钮